【推荐1】阅读下面的短文和问题，根据短文内容，完成对该问题的回答。

Exercise plays a very important role in a healthy lifestyle. But you may not have time or money to go to a gym on a regular basis. The good news is that today’s technology lets you access fitness classes from the comfort of your home.

A quick Internet search will turn up thousands of online fitness classes. These classes let you listen to instructions and watch trainers demonstrate how to do exercises. You can watch videos on your phone, computer or tablet and do the exercises right where you are. All you need is an Internet connection and a space large enough to move around in.

Online fitness classes take a wide variety of forms. Some focus on stretches and slow movements. Other classes involve fast aerobic activity, while others build muscle strength. Some require equipment such as weights, but others use only your body. This means that you can choose the class you like. And you can try a different one whenever you like.

Some virtual fitness classes require a membership fee, but some are completely free. Anyone can post a fitness video on the Internet. Not everyone knows what they are doing. So it is important to think about who is teaching the class. Try to find trainers who are certified by an organization with a good reputation.

I tried some virtual fitness classes several years ago. The reason was simple: convenience. I could do a fitness class at any time of day. I didn’t need to travel to a gym and back, which saved me a lot of time. But being able to work out any time meant I kept putting it off. I’d do everything else first and then the day would be over. I’d never actually get around to exercising. Having to exercise at a definite time means I have to put it on my schedule. So for me, scheduled classes such as those at a gym are helpful.

1. What do people need to have virtual fitness classes?
2. What is the author’s suggestion about choosing an instructor while having virtual fitness classes?
3. Please decide which part is false in the following statement, then underline it and explain why.
·The author thinks virtual fitness classes are of great convenience and save a lot of time, so he takes virtual fitness classes on a regular basis.
4. Do you think virtual fitness classes will become a trend for young people? Why or why not? (In about 40 words)

【推荐2】Have you promised that your are going to get healthier? Maybe you want to lose weight, get stronger and have more energy. Maybe you are under the doctor’s orders to eat right and take exercise more.    1    But with so many choices, it can be hard to get started. So here are healthy tips that you can follow.

Eat right. Healthy eating is harder than before. Now many supermarkets or restaurants are packed with unhealthy choices that cause weight gain and weaken energy. Over time, making poor food choices can cause illness.     2    . Eat natural and organic foods as often as possible. Cut out the junk food.

Keep healthy.     3    . So take exercise at once. Once you get started, you will be more likely to stick to it. Reduce stress. In the US, 77% of people often experience physical stress.     4    You can manage stress by taking exercise, getting enough rest and cleaning bad relationships from your life.

    5    . Sure, some people are naturally happier than others. But there are things you can consciously do to be happier. And guess what they are all free. So if you want to be happier, there are a few things to do, for example, express thanks, help others ,or how to meditate.

A．Sleep well.

B．Choose happiness.

C．Well, those all sound great.

D．But you don’t have to be concerned about it

E．That is not a group you want to be a part of.

F．So tell someone you love how you feel about them.

G．People who often take exercise are generally happier and healthier than people who don’t.

【推荐3】Working out can help teenagers boost their grades, a new study suggests. Adolescents who routinely engaged in moderate to vigorous（剧烈的）exercise showed long-term improvements in their academic performance, the British Journal of Sports Medicine study reported.

“Our study suggests that the effect of physical activity may be quite large,” John Reilly, a professor at the University of Strathclyde said. The researchers looked at a sample of about 5000 children who were involved in a long-term study that tracks children born in the UK between 1991 and 1992. When children reached 11 years old, their daily physical activity levels were measured using an accelerometer（加速器）for three to seven days. The device, similar to a pedometer（计步器）tracking the number of steps taken, recorded the average time children exercised, which was 29 minutes a day for boys and 18 for girls.

“The actual levels of daily physical activity at age 11 were quite low,” Mr. Reilly noted. The children had their academic performance tested at ages 11 and 13 with compulsory national tests for students, and also at 15 or 16 with the General Certificate of Secondary Education (GCSE) exam. The tests assessed the children’s abilities in English, math and science subjects. The results showed that the more children participated in moderate to vigorous physical activity, the higher their test scores were at age 11 in all three subjects. For girls, science scores were most strongly linked to exercise.

When children were tested again at age 13, their academic scores were still linked to how much they had exercised when they were 11 years old. By the time the youngsters took the GCSE exam, each 17-minute-per‑day increase in physical activity for the boys was linked to an improvement in their scores. Every additional 12-minute increase a day in exercise for the girls was also linked to an increased score, especially in the science category.

The researchers have called for more studies to look at the possible academic benefits that could be derived if students exercised the recommended 60 minutes or more a day.

1. What’s the study about?

A．The influence of exercise on students’ scores.

B．The secrets of students’ ranking high in class.

C．The causes of students’ participating in sports.

D．The ways of improving students’ physical conditions.

2. What is the function of the device used in the study?

A．To record how long students exercise.

B．To record the walking speed of students.

C．To record how many steps students walk.

D．To record the number of calories students consume.

3. What do the study’s results show?

A．Students at age 11 do more exercise than at other ages.

B．Boys at age 13 get more benefits by doing more exercise.

C．Girls’ science scores are more closely related to exercise.

D．More and more students do exercise to improve their scores.

4. What does the underlined word “derived” probably mean in the last paragraph?

A．adopted.	B．acquired.
C．concluded.	D．displayed.

【推荐1】This year’s flu season is pretty scary. To try to minimize the effects, public officials are still urging anyone who hasn’t yet gotten their flu shot to get one as soon as possible. However, even if every single person got a shot in the arm, the vaccine(疫 苗)—with its excellent 36 percent effectiveness—would not prevent everyone from getting infected with the annoying virus. Knowledge is power, so here's what goes on in your body when you come down with the flu.

The influenza virus primarily attacks your nose, throat, and the tubes that lead to your lungs. But the flu is so much more than that. Your muscles ache, your head hurts, and your appetite goes down, among other things. To our surprise, almost all of these symptoms   have   less   to   do   with   the   virus   itself   than   with   your   immune( 免 疫 的)response to them. Unfortunately, the very defense you have in place to get rid of the flu is the reason you feel so painful when you recover.

The virus usually enters through your mouth, typically by way of your hands . But it takes a few days for symptoms to set in. While this process might cause some harm to your nose and throat, it's nothing major, and nothing like the symptoms that typically accompany a bad or even mild case of the flu.

The real fun starts when your immune system begins to fight. Your immune system comes in two parts: the innate system and the adaptive. The innate immune system is essentially an all-purpose tool. As soon as your body senses the presence of any injury or invader , the innate immune system launches into action by producing tiny proteins called cytokines and chemokines. The cytokines reproduce almost immediately and start to attack the virus. This increase in immune cells creates a serious inflammation( 炎 症 ) throughout the body. But the worst is still to come.

Meanwhile, the chemokines work with the adaptive immune system to help create T cells. These cells are a special type of white blood cell that works in a much more specific way: They find the influenza virus, identify what's special about it, and create something unique on their surface that finds and destroys similar invaders.

1. What can we infer from Paragraph 1?

A．All the vaccine is not effective.

B．No one can avoid catching this year's flu.

C．This year's flu is the most serious one in recent years.

D．Public health officials have to use a gun when necessary.

2. Why many parts of your body suffer while you're recovering from a flu?

A．Because recovery from illness is painful.

B．Because your immune system is working against your defense system.

C．Because your body is fighting hard against the flu.

D．Because the influenza virus attacks your nose, throat and other parts.

3. The underlined word “fun” in Paragraph 4 can be replaced by .

A．joy	B．battle
C．action	D．program

4. What's the main idea of Paragraph 4?

A．The fight between innate immune system and the adaptive.

B．The categories of immune system.

C．The way immune system works.

D．The process of the development of immune system.

【推荐1】The tools scientists use to study hurricanes change constantly. So though research has suggested the warming world would produce stronger hurricanes, it has been difficult to say that with certainty. A new paper, published online on May 18, proves its certainty-studying a period of 39 years, between 1979 and 2017. Normalizing their data in a certain way, the researchers found a clear trend: Storms are getting stronger in general, and major tropical cyclones（热带气旋） are coming more often

“The main difficulty we have in finding trends is that the data are collected using the latest technology at the time,” said James Kossin, a University of Wisconsin-Madison professor. “Every year the data are a bit different than last year, and each new satellite has new tools and captures data in different ways, so in the end we have pieces of all the satellite data that have been woven together.”

To create a consistent record to work with, the researchers tried something new. They sanded the edges off their newer, sharper tropical cyclone images to fit an older standard: Images where each pixel（ represents an area 5 miles by 5 miles. They also removed images from newer satellites that provide views of storms from angles unavailable in 1998. That left them with an extensive dataset of about 225, 000 similar-quality images of about 4,000 global tropical cyclones.

The researchers found that the chances of any given tropical cyclone becoming a hurricane have gone up, and that the likelihoods of major hurricanes have gone up by about 15%-with most of that increase happening in the last 19 years of the 39-year study period.

This paper on its own doesn't rule out the idea that the uptick in hurricanes isn't the result of some perfect coincidence of other trends, the researchers wrote. But it shows the increase is happening, precisely during the period of great warming.

1. What does James Kossin consider as a problem with data collection?

A．The lack of high technology.	B．The inaccuracy of old satellites.
C．The constant change of climate.	D．The use of tools of different times.

2. What is paragraph 3 mainly about?

A．How to get consistent record.	B．How to compare different data.
C．How to improve image quality.	D．How to make the pixel change.

3. What does the word “uptick” underlined in the last paragraph probably mean?

A．Change.	B．Power.
C．Rise.	D．Danger.

4. Which of the following is the best title for the text?

A．A New Way to Fight Global Warming

B．Warming Surely Makes Hurricanes Stronger

C．Hurricanes Change Over the Past Years

D．A Special Tool of Monitoring Hurricanes

【推荐3】And then there were nine

The past two decades have seen astronomers’ catalogue of planets expand over two hundred times, as new techniques and better telescopes have found more than 2,000 of them orbiting stars other than the sun. But in the solar system itself, the list of planets has actually shrunk, Pluto (冥王星) having been downgraded from that status in 2006. The number of the sun’s planetary companions has thus fallen from nine to eight.

Now, a pair of astronomers from the California Institute of Technology think they have evidence that will restore the sun’s record to its previous value. Their analysis of objects orbiting in the Kuiper Belt (柯伊伯带), a ring of frozen asteroids (小行星) that circle beyond the orbit of Neptune (and of which Pluto is now regarded as the largest member), suggests to them that something about ten times as massive as Earth has changed those orbits. If you knew where to look, this planet-sized object would be visible through a suitable telescope. And Konstanin Batygin and Michael Brown believe they do know.

As they write in the Astronomical journal, they have analyzed the orbits of Kuiper Belt objects and found six that behave in a peculiar way. As the diagram shows, the points of closest approach of these objects to the sun, known as their perihelia, almost coincide. Moreover, these perihelia all lie near the ecliptic — the plane of Earth’s orbit and also, approximately, that of the other planets — while the objects’ orbits are all angled at 30° below the ecliptic. The chance of all this being a coincidence, the two researchers estimate, is about seven in 100,000. If it is not a coincidence, it suggests the six objects have been guided into their orbits by the gravitational intervention of something much larger.

A computer analysis Dr Batygin and Dr Brown performed suggests this something is a planet weighing 5-15 times as much as Earth, whose perihelion is on the opposite side of the sun from the cluster, and which thus orbits mainly on the other side of the solar system from the objects its orbit has affected. This planet’s perihelion would be 200 times farther from the sun than Earth’s, and the far end of its orbit might be as much as six times that distance away. This gives a search zone, and Dr Batygin and Dr Brown are using Subaru, a Japanese telescope, to perform that search.

Given other demands on Subaru’s time, it might take five years for this search to find (or not find) the hypothetical planet. But looking at some existing data from. The Widefield Infrared Survey Explore, a satellite, might also show it, if it is there to be seen.

Ironically, it was Dr Brown as much as anyone who was responsible for Pluto’s downgrading, for he discovered Eris, an object almost as big as Pluto, in 2005.

That discovery did much to damage Pluto’s planetary proof. By his own admission, he was skeptical that the anomalies he and Dr Batygin have investigated actually would point to the existence of a replacement ninth planet. He is a skeptic no longer. Whether he is actually right may soon become apparent.

1. According to Dr Batygin and Dr Brown’s research, it is quite possible that ________.

A．Pluto will restore its status as a planet of the solar system

B．the six objects in the Kuiper Belt sharing some similarities is a mere coincidence

C．there are nine planets in the solar system

D．Eris is a replacement ninth planet of the solar system

2. Which of the following is NOT true about the hypothetical planet?

A．It may have changed the orbits of six objects in the Kuiper Belt.

B．You can see it through a domestic telescope if you know where to look.

C．Compared to earth, the distance from its perihelion to the sun is about 200 times larger.

D．A satellite may be able to provide some evidence of its existence.

3. What does the underlined word anomalies stand for?

A．Six objects behaving in a peculiar way.	B．Pluto’s downgrading.
C．The discovery of Eris.	D．Some existing data.

4. The purpose of the third paragraph is to ________.

A．explain why the scientists believe there is an unfound planet

B．show how the scientists analyze the orbits of Kuiper Belt objects

C．tell us that the perihelia of the six objects almost coincide

D．introduce the two scientists’ article in the Astronomical Journal