法定蒙药材总计( ) A．57种 B．145种 C．167种 D．190种 E．2

阅读理解。

     You want to know about life in the past. Right? I can tell you. When I was a boy, things were

different. I had to get up at six every morning. That was not very bad in summer, but in winter it was

cold. And we didn't have any hot water in the house. We had to wash in cold water. We didn't have

a bathroom(浴室). My dad had some chickens. I had to feed (喂养) them every morning and then

I had to walk to school with my little sister. It was about two miles (英里) to school and about two

miles back in the evening. But it always seemed longer in the morning when we were going to school.

There was a bus, but we didn't have any money. And we had to go to bed at eleven o'clock every night

because I had too much homework and housework to do. We couldn't watch TV because there wasn't

any. On Sundays we had to go to church (教堂) three times －morning, afternoon and evening. And we

couldn't play outside on Sundays. But it wasn't all bad. We had some good times (时光). We could go

out and our parents didn't have to worry about us. There weren't so many cars on the roads then, so the

streets were safe to play in. And there were not many robbers and thieves in those days. We had to

work hard and we weren't able to buy all those things in the shops today. Life was hard, but it was

simple (单纯的) and people were happier. I don't think I'd like to be young today.

1. The writer usually went to bed _______ every night.  

A. at six

B. at eight

C. at nine

D. at eleven

2. The writer walked about _______ every day. 

A. two miles

B. three miles

C. four miles

D. five miles

3. Every morning the writer had to feed _______. 

A. his little sister

B. his lovely dog

C. his chickens

D. his father's chickens

4. The writer had a _______ but _______ family. 

A. rich; happy

B. poor; happy

C. hard; poor

D. rich; hard

5. Which of the following is NOT TRUE? 

A. The writer had a little sister. 

B. The writer couldn't take the school bus. 

C. The writer and his sister never had any good times

D. The write had to get up at six

从1、2、3、4这四个中任意抽出三个，能组成三角形三边的概率是______．

大量实验表明，使用机械时人们所做的功都______________，也就是说使用任何机械都不能___________，这个结论叫做__________。

不论是透明的还是彩色的隐形眼镜，透氧性都是重要的指标。角膜表面没有血管，是自己独立呼吸的器官，它通过直接与空气接触来获得氧。如果角膜获得的氧不足，那么角膜上皮细胞的健康就会受到影响，抵抗力也会变弱，如果是长期缺氧，角膜就要“呼救”了；周边组织向角膜内生长入新生血管，通过血液来给角膜供氧。因此，长期戴隐形眼镜的人，______。
填入划横线部分最恰当的一句是：

A．眼角膜可能会因此缺氧

B．眼珠边缘可能会出现红血丝

C．眼角膜的抵抗力可能下降

D．眼角膜细胞的健康就会受影响

简述影视镜头及其基本分类。