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题型:阅读理解-阅读单选 难度:0.65 引用次数:84 题号:9927018

Using natural and organic products for skincare is increasingly popular-and that includes suncream. Many websites, including Pinterest and Instagram, feature users' recipes for homemade suncream. Judging from the comment, the rise in interest for homemade suncream is because some people fear the chemicals in shop-bought suncream and believe that natural products mixed at home will be better at protecting them from the sun's harmful rays. The fear originates from recent news that some suncream elements seem to disturb hormones (荷尔蒙).

Many of the homemade suncream recipes contain elements like shea butter and cocoa butter as well as coconut and vitamin E oils. The sun protection factor (SPF) values for these elements, according to the authors of these recipes, are between four and six. These SPF values, if true, are not enough to protect the skin against the harmful effects of sunlight. Some recipes include carrot seed essential oil, which the authors claim to have an SPF of 35-40. But this is unlikely, given the small amount used in these recipes. The European Commission recommended SPF factor for moderate skin protection is 15-29 (and 30-50+ for high protection).

The sun's most harmful rays are ultraviolet (UV) radiation-notably UVB and UVA radiation. UVB has a shorter wavelength and doesn't go far into the skin, but it is very dangerous as it can change the DNA in skin cells and cause skin cancer. UVA has a longer wave- length and can go much deeper into the skin. UVA can cause harmful reactive oxygen molecules (分子)called “free radicals” to form. These molecules can damage fat, protein and DNA in the skin, thereby weakening the normal function of skin cells.

Shop-bought suncream contains approved UV-blocking molecules that block UVA and UVB rays. Zinc oxide (氧化锌)is one of these UV-blocking materials. It has been extensively tested to determine the most effective size for blocking harmful rays. It is not clear whether the zinc oxide powder recommended for the homemade recipes meets with the recommended size or proportion needed.

1. What may concern consumers of the shop-bought suncream?
A.The price of it.B.The hormones in it.
C.The chemicals in it.D.The production process of it.
2. What are SPF values used for?
A.Measuring the amount of chemicals in suncream.
B.Measuring the harm suncream do to people.
C.Measuring the hormone level of suncream.
D.Measuring the protective effect of suncream.
3. What does paragraph 3 mainly talk about?
A.How sun protection products work.
B.What harm the sun's rays bring to skin.
C.How the sun's most harmful rays form.
D.How UVB and UVA radiation can be blocked.
4. What can be inferred from the last paragraph?
A.Shop-bought suncream needs more tests.
B.More zinc oxide powder is beneficial to skin.
C.Shop-bought suncream is more suitable for people.
D.More chemicals will be added into shop-bought suncream.

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【推荐1】You know the drill when it comes to losing weight: take in fewer calories and burn more calories.    1    If you're trying to drop a few pounds fast, these interesting tips will make it easy for you to lose the weight quick.

Eat in front of mirrors and you'll lose weight

One study finds that eating in front of mirrors reduces the amount people eat by nearly one third. Having to look yourself in the eye reflects back some of your own inner standards and goals.    2    

Sniff a banana or an apple when you feel hungry

    3    Researchers find that the more frequently people sniff, the less hungry they are and the more weight they lose—an average of 30 pounds each. One theory is that sniffing the food tricks the brain into thinking you're actually eating it.

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Whether that's a floor, a couple of windows, or your car, a 150-pound person will burn about four calories for every minute spent cleaning. Scrub for 30 minutes and you could work off approximately 120 calories, the same number in a half-cup of frozen yogurt.

Start at the color blue

There's a good reason you won't see many fast-food restaurants decorated in blue: it helps to control an appetite. So serve up dinner on blue plates, dress in blue while you eat, and cover your table with a blue tablecloth.     5    Studies find they encourage eating.

A.You might feel silly, but it works.
B.Therefore, adjust your eating habits.
C.Wash something thoroughly once a week.
D.That's all it takes to lose as many pounds as possible.
E.On the contrary, avoid red, yellow, and orange in your dining areas.
F.In other words, it reminds you of why you're trying to lose weight in the first place.
G.But you also know that most diets and quick weight-loss plans don't work as promised.
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【推荐2】Some recent surveys show that the health conditions of many white collar employees and office workers are rather critical. Death cases among white collar employees and office workers are increasing year by year and these cases are generally believed to have been caused by overwork and spend little time taking rest or doing exercise.

If their offices are within the distance of half an hour’s walk, some office workers now choose to go to work on foot. Ms. Deng, who works in a foreign enterprise in Beijing, has been walking to her office for more than six months now. “I usually have a tight work schedule and can’t find time to do exercise. So I choose to walk to work.” As she said, if the office is not far from home, most women would like to go to work on foot. Walking is good for their health and can help them to keep good figures as well.

Apart from walking to office, one can also find time to do exercise when one is at work. The simplest way is to abandon the lift. Mr. Wei, who works in the Passenger Service Department at Shenzhen Airlines, is one of such men who frequently climb stairs to his office. “I only use the lift whenever I’m with my colleagues or my boss. Otherwise, I would climb stairs instead of taking the lift.”

In addition, some office workers try to find time to go to a gym at the end of a day. Ms. Sang works in a law firm in Shenzhen. She goes to the gym several times a week when she has the time. “I go to the gym every weekend. During the weekdays, I will also go there whenever I have the time.” Ms. Sang and her husband both have a gym membership card for a whole year. The cards cost them 3,000 yuan. However they think it’s worth it.

1. Why are death cases among white collar employees and office workers increasing year by year?
A.Because they overwork for a long time.
B.Because they are too busy to have time for a rest.
C.Because they hardly have time to do exercise after work.
D.All of the above.
2. How many ways that office workers keep healthy are mentioned in the passage?
A.3B.4C.5D.6
3. Which of the following sentence can be added between Paragraph 1 and Paragraph 2?
A.Then, what shall office workers do next to prevent death cases?
B.What will happen to office workers?
C.In order to keep themselves healthy, some office workers now take measures as follows:
D.Working on foot is the best way for office workers.
4. The best title of the passage is ________.
A.Health Is Very ImportantB.Office Workers Try to Keep Healthy
C.How to Keep Healthy                           D.Office Workers’ Trouble
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【推荐3】What you do after studying could have a big effect(影响)on how well you learn and remember. Today on Education Tips, we will explore two no-cost ways that can help you improve your learning: wakeful rest and sleep.

When many students finish studying, they often go straight to another activity. Perhaps they look at their phone or computer. They might even play a video game or watch television. But research suggests that resting after your study may help you remember what you have studied.

The basic idea is this: by stopping your activity after the study, your brain gets a chance to rest. Resting is difficult when you are playing computer games.

While this might sound unusual to you, many studies have explored the benefits(好处)of resting after learning —what is called “wakeful rest”.

A 2019 study found that both young and older adults were able to better remember information they learned after doing wakeful rest.

If you want to give “wakeful rest” a try, here are a few simple things to do. Rest quietly for five to ten minutes. Do not look at your phone, read stories or play games. It is really that easy!

Besides wakeful rest, sleep is also important for learning. The Division of Sleep Medicine at Harvard Medical School(HMS) notes that sleep helps people to learn in two ways. A report on the school’s website explains that “a sleep-deprived(剥夺)person cannot focus attention well and therefore cannot learn well”. It also says, “Sleep itself helps us to memorize and that memorizing is very important for learning new information.”

The National Sleep Foundation(NSF) suggests that adults between the ages of 20 and 64 get between 7 and 9 hours of sleep per day. Teenagers may need a little bit more, and people over the age of 65 may need a little less.

Try to get some “wakeful rest” after a study. Then try to get a good night’s sleep. That’s it —a simple, no-cost way to help you remember what you learn.

1. Which activity might be recommended shortly after studying?
A.Reading a newspaper.B.Playing a video game.
C.Sitting there doing nothing.D.Having a nice sleep at night.
2. What is paragraph 3 mainly about?
A.The importance of sleep.
B.The good ways to get a rest.
C.The reason for having a rest
D.The types of resting activities.
3. How long should teenagers sleep each day according to NSF?
A.Less than 7 hours.B.Just 7 hours.
C.No more than 9 hours.D.Around 9 hours.
4. What can be a suitable title for the text?
A.Low-cost Tips on Working
B.Good Things to Do After Your Study
C.Why Do We Need to Have a Good Sleep?
D.How Long Should We Rest After Learning?
2021-11-28更新 | 79次组卷
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