问题 选择题

我从新买的衣服边上取下一段线头在火上灼烧,闻到一股烧焦羽毛的气味,由此我判断这件衣服的面料是 [ ]

A.棉

B.麻

C.羊毛

D.化学纤维

答案

答案:C

题目分析:

选项A.棉的主要成分是纤维素,和纸张中的纤维相同,燃烧时发出烧纸的气味,所以错误。
选项B.麻麻的主要成分是纤维素,和纸张中的纤维相同,燃烧时发出烧纸的气味,所以错误。

选项 C.羊毛的主要成分是蛋白质,羊毛燃烧时发出烧焦羽毛的气味,所以正确。选项D.化学纤维是石油产品,燃烧时会发出强烈的刺激性气味,所以错误。

故选:C.

阅读理解

阅读理解

       Mike and Dick work in the same office. They don't like the cold weather. And one day they decided

to take their holiday in Australia. Their plane arrived in Sydney at nine in the morning. They had a good

rest in a hotel. The next morning they rented(租) a car in the city and began their travel. A few hours later

the sun was shining in the sky and there were no shade trees(遮阴树) beside the road. It was so hot that

they could hardly go on driving. They had to stop to look around. Mike found a river was about half a

kilometer away from them. They were both very happy and drove the car quickly. Soon they got to the

river. Before they jumped into the water, Dick saw a boy playing under a big tree. He asked,"Are there

any sharks(鲨) in the river, boy?""No, there aren't,"answered the boy. So they began to swim in the river. After a while, Dick felt something hit against his leg. He told Mike about it. They were afraid and stopped

swimming. Dick asked loudly,"Is it true that there aren't any sharks in the river?""Yes, sir,"said the boy,

"there're a lot of crocodiles(鳄鱼) in the water. All the sharks have swum away!"

根据短文内容,回答下列问题。

1. When did they arrive in Sydney?

_____________________________________________

2. What was the weather like the next day?

_____________________________________________

3. What did they do in the river?

_____________________________________________

4. A shark hit Dick's leg, didn't it?

_____________________________________________

5. Why weren't there any sharks in the river?

_____________________________________________

单项选择题