问题 选择题

PM2.5指大气中直径小于或等于2.5微米的颗粒物.PM2.5漂浮在空中,进入人体肺泡,对健康影响很大.大雾天气可导致呼吸道病人增多.因为雾霾可使空气中增加大量的(  )

A.可吸入颗粒物

B.二氧化碳

C.二氧化硫

D.氮氧化合物

答案

空气污染的途径主要有两个:有害气体和粉尘.有害气体主要有一氧化碳、二氧化硫、二氧化氮等气体;粉尘主要是固体小颗粒,如地面粉尘、燃煤排放的粉尘、沙尘暴等.大雾天气可导致呼吸病人增多,因为雾霾可使空气中增加大量的可吸入颗粒物.

A、大雾天气可导致呼吸病人增多,因为雾霾中有一些直径小于或等于2.5微米的颗粒物,可使空气中增加大量的可吸入颗粒物,故A正确;

B、二氧化碳没有被列入空气质量检测范围,也不会增加可吸入颗粒,故B错误;

C、二氧化硫是有毒气体,不是微小颗粒,不会增加可吸入颗粒,不会导致呼吸病人增多,故C错误;

D、氮氧化合物有毒,不是微小颗粒,不会导致呼吸病人增多,故D错误.

故选A

完形填空

阅读下面的短文,并根据文章后的题目要求回答小题。

(1)While adults need to eat breakfast each day to perform their best, kids need it even more. Their growing bodies and developing brain rely heavily on the regular intake of food. When kids skip breakfast , they can end up going for as long as eighteen hours without food. This period of semi-starvation can create a lot of physical, intellectual, and behavioral problems for them.

(2)If you and your kids regularly skip breakfast to save time or to get a few more minutes of sleep, remember that eating a healthy morning meal will probably save your time in the long run. By recharging your brain and your body, you’ll be more efficient in just about everything you do.

(3)Interestingly, studies show that kids who skip breakfast are late for and absent from school more often than children who eat breakfast on a regular basis. Time invested in breakfast is much more valuable than the few extra minutes of sleep you might get by skipping the morning meal. If you and your kids seem unable to make time for breakfast, consider enrolling your children in a school breakfast program. If possible, pack a breakfast brown-bag the night before so that you and your kids can eat on the way to school and work.

(4)Some people skip breakfast in an effort to lose weight, but actually it is more likely to cause weight gain rather than weight loss. Skipping breakfast is strongly linked to the development of obesity. According to research, skipping meals, especially breakfast, can actually make weight control _______________. Breakfast skippers tend to eat more food than usual at the next meal or eat high-calorie snacks to get rid of hunger.

(5)To teens, especially teenage girls, skipping breakfast may seem like a perfect way to lose weight. It’s important for moms to educate their kids about the importance of the morning meal and role it plays in maintaining good health and preventing obesity.

1. What is mainly discussed in the passage? (no more than 6 words)

_______________________________________________________________________________

2. Complete the following statement with proper words. (no more than 3 words)

Sparing some time ______________ is more beneficial to you than skipping it for more sleep.

3. List three reasons why many kids and adults skip breakfast. (no more than 10 words)

_______________________________________________________________________________

4.Fill in the blank in Paragraph 4 with proper words. (no more than 4 words)

____________________________________________________________________________

5. What does the underlined word “it” in the last paragraph probably refer to? (no more than 3 words)

_______________________________________________________________________________

单项选择题 案例分析题