题目内容

Nobody noticed he entered the room because the lights _________________ burst.

A. happened to B. were to

C. in order to D. should have

A

【解析】

试题解析：考查短语用法。A.发生于，偶然发生，碰巧 B. be to的过去式，意为“将要做（表示预先安排好的计划或约定） C.为了，以便 D.应该有，本应该 句意：灯突然爆掉，所以没人注意到他进入了房间。故选A。

考点：考查短语用法。

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阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

Nowadays, many cities are suffering from smog, the short form of smoke and fog. It is especially harmful to children, seniors, pregnant women, smokers and people 1. lung or heart problems.

An important component (成分) of smog is ground-level ozone (地面臭氧). Actually, ozone that is formed naturally in the atmosphere 2. (protect) life from the sun’s damaging rays. At ground level, however, ozone hurts people’s eyes, nose, and throat, which can make 3. more difficult for the body to fight against an 4. (infect). When the amount of ground-level ozone increases, so does 5. number of emergency-room visits.

The other component is fine particulate matter (细颗粒物). The 6. (small) the particle (particulate matter 2.5, PM2.5), the more dangerous it can be. When people take in ozone and particulates from the air, both the blood flow 7. the oxygen supply to the heart will be reduced.?

With such unhealthy air quality, some simple ways are recommended for you 8. (reduce) higher risk of health problems. On smoggy days, spend less time outdoors. If you have to get outside, close all your windows 9. you go out. Besides, roll up the windows of 10. car if you are driving.

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根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

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1.

We are drawn to people who smile. There is an attraction factor. We want to know a smiling person and figure out what is so good because anxieties can push people away, but a smile draws them in.

Smiling Changes Our Mood

Next time you are feeling down, try putting on a smile. 2. Smiling can trick the body into helping you change your mood.

Smiling Relieves Stress

Stress can really show up in our faces. Smiling helps to prevent us from looking tired or worn down. 3. The stress should be reduced and you'll be better able to take action.

Smiling lowers your blood pressure.

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5.

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