It is important to keep industrial waste from...

It is important to keep industrial waste from entering the rivers and lakes. If we do not do so, efforts to protect the environment will ____________.

A.Go down the drain B.suck it and see

C.make the headlines D.smooth the way

高三英语单项填空困难题查看答案及解析

It is important to protect yourself from harmful rays. But if you think a high-factor sunscreen keeps you safe from harmful rays, you may be wrong. Research in this week’s Nature shows that while factor 50 reduces the number of melanomas（黑瘤）and delays their occurrence, it can’t prevent them. Melanomas are the most aggressive skin cancers. You have a higher risk if you have red or blond hair, fair skin, blue or green eyes, or sunburn easily, or if a close relative has had one. Melanomas are more common if you have periodic intense exposure to the sun. Other skin cancers are increasingly likely with long-term exposure.

There is continuing debate as to how effective sunscreen is in reducing melanomas – the evidence is weaker than it is for preventing other types of skin cancer. A 2011 Australian study of 1,621 people found that people randomly selected to apply sunscreen daily had half the rate of melanomas of people who used cream as needed. A second study, comparing 1,167 people with melanomas to 1.101 who didn’t have the cancer, found that using sunscreen routinely, alongside other protection such as hats, long sleeves or staying in the shade, did give some protection. This study said other forms of sun protection – no sunscreen – seemed most beneficial. The study relied on people remembering what they had done over each decade of their lives, so it’s not entirely reliable. But it seems reasonable to think sunscreen gives people a false sense of security in the sun.

Many people also don’t use sunscreen properly applying insufficient amounts, failing to reapply after a couple of hours and staying in the sun too long. It is sunburn that is most worrying – recent research shows five episodes of sunburn in the teenage years increases the risk of all skin cancers.

The good news is that a combination of sunscreen and covering up can reduce melanoma rates, as shown by Australian figures from their slip-slop-slap campaign. So if there is a heat wave this summer, it would be best for us, too, to slip on a shirt, use sunscreen and slap on a hat.

1.What’s people’s common expectation of high-factor sunscreen?

A. It will protect them from sunburn.

B. It will keep their skin smooth ad fair.

C. It will work for people of any skin color.

D. It will delay the occurrence of skin cancer.

2.What can we learn from the second paragraph?

A. Sunscreen can prevent all kinds of skin cancers.

B. The studies are based on direct observation of the subjects.

C. The studies may help people select the most effective sunscreen.

D. Daily application of sunscreen helps reduce the incidence of melanomas.

3.What does the author suggest in order to reduce melanoma rates?

A. Staying in the shade whenever possible.

B. Using covering up instead of sunscreen.

C. Using both covering up and sunscreen.

D. Applying the right amount of sunscreen.

4.What is the best title for the text?

A. No Way to Stop Harmful Rays!

B. Does Sunscreen Prevent Skin Cancer?

C. Did You Use Sunscreen In the Right Way?

D. Skin Cancer-The Biggest Threat to Human Beings!

高三英语阅读理解中等难度题查看答案及解析

Outdoor air pollution is an obvious danger because it’s hard to miss.Auto gases, industrial waste, city smog—everyone knows they’re a health hazard(危险) and a call for solutions is on everyone’s lips.But there’s another threat just as perilous— a hidden threat(威胁) we are usually unaware of.We’re speaking about the threat of indoor air pollution.

The dangers caused by indoor air pollution are too often underestimated(低估) and overlooked.According to a recent study, indoor air pollution can be many times higher than outdoor air pollution.A similar study by the Environmental Protection Agency shows that, in general, the air in our homes and offices is two to five times more polluted than outdoor air.

Scientific studies have found that indoor air pollution exacerbates(恶化) the symptoms of asthma(哮喘), and contributes to causing nausea(恶心), headaches and damage to the central nervous system.Evidence has even been found linking poor indoor air quality to certain cancers.Children who spend eighty percent of their time inside are particularly affected by indoor air pollution.

Cigarette smoke, chemical fertilizers(肥料), perfumes and clothing that has been dry-cleaned may contribute to indoor air pollution.Building materials—including paint and glue—are also contributors.

And homes aren’t the only indoor areas affected by this danger.Offices are affected too—sometimes more so—with their copy machines and printers, inks and processing solutions (显影液)and so on.

Fortunately there are many ways to reduce indoor air pollution and improve indoor air quality in your home and office.A major first step would be the use of an air purifier(净化器).

1.What does the underlined word “perilous” mean?

A.Nervous.　 B.Similar.　 C.Obvious.　 D.Dangerous.

2.The author mentions some studies in Paragraph 2 to show indoor air pollution__________.

A.is recently overestimated

B.is very common and serious

C.has drawn people’s attention

D.is linked to many serious diseases

3.Which of the following is the usual contributor of air pollution in our homes?

A.Smoking. 　　　 B.Printing.

C.Copy machines.D.Processing solutions.

7.4.What would be discussed in the paragraph that follows?

A.An introduction to the air purifier.

B.Other dangers of indoor air pollution.

C.Other sources of indoor air pollution.

D.More solutions to the problem of air pollution.

高三英语阅读理解中等难度题查看答案及解析

In the face of ____failure, it is the most important to keep up ____good state of mind.

A. /; the     B. a; /     C. the; /     D. /; a

高三英语单项填空困难题查看答案及解析

In face of ____ failure, it is the most important to keep up ____ good state of mind.

高三英语单项填空中等难度题查看答案及解析

Faced with_______ failure, it is the most important for us to keep up ______good state of mind.

A.  / ; a                       B.  a ; /                               C.  the ; /                           D ./ ; the

高三英语单项填空简单题查看答案及解析

In face of _______ failure, it is the most important to keep up ________ good state of mind.

高三英语单项填空简单题查看答案及解析

In face of _______ failure, it is the most important to keep up ________ good state of mind.

A. 不填; a         B. a; 不填            C. the; 不填         D. 不填; the

高三英语单项填空中等难度题查看答案及解析

In face of ________failure, it is the most important to keep up________good state of mind.

A．a; 不填                   B．不填；a                  C．the; 不填               D．不填；the

高三英语单项填空简单题查看答案及解析

(2013·吉林长春三校高三调研)It is important to introduce children to healthy nutritious foods from ________ they begin to eat solids.

A．what　     B．when

C．that　     D．which

高三英语单项填空中等难度题查看答案及解析