问题 填空题

甲打靶射击,有4发子弹,若有1发是空弹,则空弹出现在前三枪的概率为______.

答案

由题意知本题是一个等可能事件的概率,

试验发生包含的事件是从4发子弹中任意取1发,共有4种结果,

满足条件的事件是在前三法中取1法,共有3种结果,

根据等可能事件的概率知P=

3
4

故答案为:

3
4

阅读理解

阅读理解

     Mrs. White was very fat. She weighed (重) 100 kilos, so she went to see a doctor. The doctor said,

"You need a diet (节食), Mrs. White, and I have a good way here." He gave Mrs. White a small book

and said, "Read this carefully and eat the things on page 11 every day. Then come back and see me in

two weeks."

     Mrs. White came again two weeks later, but she wasn't thinner. She was fatter than before. The

doctor was surprised and asked, "Are you eating the things on page 11 of the small book?" "Yes,

doctor." she answered.

     The next day the doctor visited Mrs. White during her dinner. He was very surprised at what he

saw. "Mrs. White,"  he said, "why are you eating potatoes and bread? They aren't in your diet."

"Doctor," Mrs. White answered, "I follow my diet at lunchtime. But this is my dinner."

1.Why did Mrs. White go to see a doctor?

A.Because she had a bad cold.

B.Because she felt terrible.

C.Because the doctor was her friend.

D.Because she wanted to be thinner.

2.The doctor asked her to _______.

A.eat more food

B.eat less food

C.eat nothing

D.eat healthy food

3.After two weeks,Mrs. White became _______.

A.fatter

B.thinner

C.healthier

D.stronger

4.Why was the doctor surprised when he visited Mrs. White during her dinner?

A.Because she eat nothing.

B.Because she was eating meat.

C.Because she was eating potatoes and bread.

D.Because she wasn't in.

5.What's the meaning of "I follow my diet at lunchtime. But this is my dinner."?

A.She always followed the diet.

B.She didn't follow the diet.

C.She didn't like the diet.

D.She only followed the diet at lunchtime, and she didn't follow the diet at dinner.

填空题