2 . Rainforests are home to a rich variety of medicinal plants, food, birds and animals. Can you believe that a single bush（灌木丛）in the Amazon may have more species of ants than the whole of Britain! About 480 varieties of trees may be found in just one hectare of rainforest.

Rainforests are the lungs of the planet-storing vast quantities of carbon dioxide and producing a significant amount of the world's oxygen. Rainforests have their own perfect system for ensuring their own survival; the tall trees make a canopy（树冠层）of branches and leaves which protect themselves, smaller plants, and the forest animals from heavy rain, intense dry heat from the sun and strong winds.

Amazingly, the trees grow in such a way that their leaves and branches, although close together, never actually touch those of another tree. Scientists think this is the plants' way to prevent the spread of any tree diseases and make life more difficult for leaf-eating insects like caterpillars. To survive in the forest, animals must climb, jump or fly across the gaps. The ground floor of the forest is not all tangled leaves and bushes, like in films, but is actually fairly clear. It is where dead leaves turn into food for the trees and other forest life.

They are not called rainforests for nothing! Rainforests can generate 75%of their own rain. At least 80 inches of rain a year is normal-and in some areas there may be as much as 430 inches of rain annually. This is real rain-your umbrella may protect you in a shower, but it won't keep you dry if there is a full rainstorm. In just two hours, streams can rise ten to twenty feet. The humidity（湿气）of large rainforests contributes to the formation of rainclouds that may travel to other countries in need of rain.

1. What can we learn about rainforests from the first paragraph?

A．They produce oxygen.	B．They cover a vast area.
C．They are well managed.	D．They are rich in wildlife.

2. Which of the following contributes most to the survival of rainforests?

A．Heavy rains	B．Big trees.
C．Small plants.	D．Forest animals.

3. Why do the leaves and branches of different trees avoid touching each other?

A．For more sunlight.	B．For more growing space.
C．For self-protection.	D．For the detection of insects.

4. What can be a suitable title for the text?

A．Life-Giving Rainforests	B．The Law of the Jungle
C．Animals in the Amazon	D．Weather in Rainforests

5 . For those who can stomach it, working out before breakfast may be more beneficial for health than eating first, according to a study of meal timing and physical activity.

Athletes and scientists have long known that meal timing affects performance. However, far less has been known about how meal timing and exercise might affect general health.

To find out, British scientists conducted a study. They first found 10 overweight and inactive but otherwise healthy young men, whose lifestyles are, for better and worse, representative of those of most of us. They tested the men’s fitness and resting metabolic (新陈代谢的) rates and took samples (样品) of their blood and fat tissue.

Then, on two separate morning visits to the scientists’ lab, each man walked for an hour at an average speed that, in theory, should allow his body to rely mainly on fat for fuel. Before one of these workouts, the men skipped breakfast, meaning that they exercised on a completely empty stomach after a long overnight fast (禁食). On the other occasion, they ate a rich morning meal about two hours before they started walking.

Just before and an hour after each workout, the scientists took additional samples of the men’s blood and fat tissue.

Then they compared the samples. There were considerable differences. Most obviously, the men displayed lower blood sugar levels at the start of their workouts when they had skipped breakfast than when they had eaten. As a result, they burned more fat during walks on an empty stomach than when they had eaten first. On the other hand, they burned slightly more calories (卡路里), on average, during the workout after breakfast than after fasting.

But it was the effects deep within the fat cells that may have been the most significant, the researchers found. Multiple genes behaved differently, depending on whether someone had eaten or not before walking. Many of these genes produce proteins (蛋白质) that can improve blood sugar regulation and insulin (胰岛素) levels throughout the body and so are associated with improved metabolic health. These genes were much more active when the men had fasted before exercise than when they had breakfasted.

The implication of these results is that to gain the greatest health benefits from exercise, it may be wise to skip eating first.

1. The underlined expression “stomach it” in Paragraph 1 most probably means “______”.

A．digest the meal easily	B．manage without breakfast
C．decide wisely what to eat	D．eat whatever is offered

2. Why were the 10 people chosen for the experiment?

A．Their lifestyles were typical of ordinary people.

B．Their lack of exercise led to overweight.

C．They could walk at an average speed.

D．They had slow metabolic rates.

3. What happened to those who ate breakfast before exercise?

A．They successfully lost weight.	B．They consumed a bit more calories.
C．They burned more fat on average.	D．They displayed higher insulin levels.

4. What could be learned from the research?

A．A workout after breakfast improves gene performances.

B．Too much workout often slows metabolic rates.

C．Lifestyle is not as important as morning exercise.

D．Physical exercise before breakfast is better for health.

6 . The problem of robocalls has gotten so bad that many people now refuse to pick up calls from numbers they don’t know. By next year, half of the calls we receive will be scams(欺诈). We are finally waking up to the severity of the problem by supporting and developing a group of tools, apps and approaches intended to prevent scammers from getting through. Unfortunately, it’s too little, too late. By the time these “solutions”(解决方案) become widely available, scammers will have moved onto cleverer means. In the near future, it’s not just going to be the number you see on your screen that will be in doubt. Soon you will also question whether the voice you’re hearing is actually real.

That’s because there are a number of powerful voice manipulation(处理) and automation technologies that are about to become widely available for anyone to use. At this year’s I/O Conference, a company showed a new voice technology able to produce such a convincing human-sounding voice that it was able to speak to a receptionist and book a reservation without detection.

These developments are likely to make our current problems with robocalls much worse. The reason that robocalls are a headache has less to do with amount than precision. A decade of data breaches(数据侵入) of personal information has led to a situation where scammers can easily learn your mother’s name, and far more. Armed with this knowledge, they’re able to carry out individually targeted campaigns to cheat people. This means, for example, that a scammer could call you from what looks to be a familiar number and talk to you using a voice that sounds exactly like your bank teller’s, tricking you into “confirming” your address, mother’s name, and card number. Scammers follow money, so companies will be the worst hit. A lot of business is still done over the phone, and much of it is based on trust and existing relationships. Voice manipulation technologies may weaken that gradually.

We need to deal with the insecure nature of our telecom networks. Phone carriers and consumers need to work together to find ways of determining and communicating what is real. That might mean either developing a uniform way to mark videos and images, showing when and who they were made by, or abandoning phone calls altogether and moving towards data-based communications—using apps like FaceTime or WhatsApp, which can be tied to your identity.

Credibility is hard to earn but easy to lose, and the problem is only going to get harder from here on out.

1. How does the author feel about the solutions to problem of robocalls?

A．Panicked.

B．Confused.

C．Embarrassed.

D．Disappointed.

2. Taking advantage of the new technologies, scammer can ________.

A．aim at victims precisely	B．damage databases easily
C．start campaigns rapidly	D．spread information widely

3. What does the passage imply?

A．Honesty is the best policy.

B．Technologies can be double-edged.

C．There are more solutions than problems.

D．Credibility holds the key to development.

4. Which of the following would be the best title for the passage?

A．Where the Problem of Robocalls Is Rooted

B．Who Is to Blame for the Problem of Robocalls

C．Why Robocalls Are About to Get More Dangerous

D．How Robocalls Are Affecting the World of Technology

7 . Alice Moore is a teenager entrepreneur(创业者), who in May 2015 set up her business AilieCandy. By the time she was 13, her company was worth millions of dollars with the invention of a super-sweet treat that could save kids’ teeth, instead of destroying them.

It all began when Moore visited a bank with her dad. On the outing, she was offered a candy bar. However, her dad reminded her that sugary treats were bad for her teeth. But Moore was sick of missing out on candies. So she desired to get round the warning, “Why can’t I make a healthy candy that’s good for my teeth so that my parents can’t say no to it?” With that in mind, Moore asked her dad if she could start her own candy company. He recommended that she do some research and talk to dentists about what a healthier candy would contain.

With her dad’s permission, she spent the next two years researching online and conducting trials to get a recipe that was both tasty and tooth-friendly. She also approached dentists to learn more about teeth cleaning. Consequently, she succeeded in making a kind of candy only using natural sweeteners, which can reduce oral bacteria.

Moore then used her savings to get her business off the ground. Afterwards, she and her father secured their first business meeting with a supermarket owner, who finally agreed to sell Moore’s product—CanCandy.

As CanCandy’s success grows, so does Moore’s credibility as a young entrepreneur. Moore is enthusiastic about the candy she created, and she’s also positive about what the future might bring. She hopes that every kid can have a clean mouth and a broad smile.

Meanwhile, with her parents’ help, Moore is generally able to live a normal teenage life. Although she founded her company early on in life, she wasn’t driven primarily by profit. Moore wants to use her unique talent to help others find their smiles. She donates 10% of AilicCandy’s profits to Big Smiles. With her talent and determination, it appears that the sky could be the limit for Alice Moore.

1. How did Moore react to her dad’s warning?

A．She argued with him.	B．She tried to find a way out.
C．She paid no attention.	D．She chose to consult dentists.

2. What is special about CanCandy?

A．It is beneficial to dental health.	B．It is free of sweeteners.
C．It is sweeter than other candies.	D．It is produced to a dentists’ recipe.

3. What does Moore expect from her business?

A．To earn more money.	B．To help others find smiles.
C．To make herself stand out.	D．To beat other candy companies.

4. What can we learn from Alice Moore’s story?

A．Fame is a great thirst of the young.

B．A youth is to be regarded with respect.

C．Positive thinking and action result in success.

D．Success means getting personal desires satisfied

10 . Kristin Schell is the founder of The Turquoise Table, a movement of ordinary people who want to create community right in their own front yards. Ten years ago, she and her family moved to a new home in Austin, Texas.

One day, Kristin tried to connect with her new neighbors by hosting a party. She bought a few picnic tables but the delivery driver set one table down in her front yard by mistake. “After the party, I painted the table turquoise—my favorite color—and put it in the front yard, just a few feet from the sidewalk,” she says.

That turquoise table became the place where Kristin and her kids hung out. They played games, did crafts and ate snacks. “We got intentional about where we spent our time,” Kristin says. “We became ‘front yard people’.”

Neighbors began to stop by to introduce themselves and sit down for a chat. Kristin invited people to join her at the table for coffee or iced tea. Then neighbors asked Kristin if their family could put a picnic table in their front yard too. A movement was born. “It was a simple way to slow down and connect with others,” she says. The turquoise table was inviting and had a shared feel.

People often hesitate to invite others into their homes. They think their house is too messy, it’s not big enough or they don’t have enough time. “Our perfectionism can cause us to miss out on the joy of connecting with others,” Kristin says. Her picnic table takes away the excuses—and the pressure.

She likes how it enables her to take a small step toward easing loneliness and building relationships in her community. “People’s greatest need is to know that they are loved and that they belong,” she says.

A decade after their Texas beginnings, thousands of Turquoise Tables exist in all 50 states and in 13 countries around the world. Not all of them are actually turquoise. “No matter what color it is, it’s a friendship table,” Kristin says.

1. Why did Kristin Schell start the movement?

A．To host more parties in her front yard.	B．To entertain her friends and neighbors.
C．To engage with people in the neighbourhood.	D．To create harmonious communities worldwide.

2. Which of the following words best describe Kristin Schell according to the text?

A．Creative and sociable.	B．Friendly and humorous.
C．Generous and ambitious.	D．Cautious and responsible.

3. What can be inferred from the text?

A．People don’t like others to step into their houses.

B．The campaign has a big impact at home and abroad.

C．Kristin Schell bought the turquoise table to host a party.

D．People feel unwilling to join in the front ya rd chat at first.

4. Which of the following is a suitable title for the text?

A．Love Your Neighbors	B．An Amazing Woman
C．Happy Front Yard Time	D．Tables Where All Are Welcome