问题 单项选择题

现有边长1米的一个木质正方体,已知将其放入水里,将有0.6米浸入水中,如果将其分割成边长0.25米的小正方体,并将所有的小正方体都放入水中,直接和水接触的表面积总量为()。

A.3.4平方米

B.9.6平方米

C.13.6平方米

D.16平方米

答案

参考答案:C

解析:

由题意可知,每个正方体的侧面有3/5浸入水中,于是每个小正方体直接和水接触的表面积为

平方米,由于共有

个这样的小正方体,所以这些小正方体直接和水接触的表面积为17/80×64=13.6平方米。故选C。

阅读理解

阅读理解。

     Mr. Grey was a biology professor, and he had a collection of very unusual bones. He was very proud

of them. Then one year he got a new and better job at another university, so his wife called a truck to carry

all their possessions (东西) to their new home while her husband was away at work.

     The next day three men started taking the things out of Mrs Grey's house and putting them into the truck,

when one of them brought out a large wooden box. He was about to throw it into the truck with all the other

things when Mrs Grey ran out of her house and said , "Please treat that box very carefully! That one has all

my husband's bones in it."

     The man was so surprised that he nearly dropped the box on his feet.

1.Mr. Grey was very proud of his collection of bones because _____. [ ]

A. they were very expensive

B. they were of all kinds of animals

C. they were not ordinary and very difficult to get

D. they were useful in his work

2.Which of the following is not right? [ ]

A. Mr. Grey wasn't pleased with his old job.

B. Mrs. Grey was his husband's good helper.

C. Mr. Grey cared more for the bones than for anything else.

D. The truck wasn't the Greys'.

3.In this passage, "my husband's bones" means "_____". [ ]

A. bones collected by my husband

B. bones left by my husband after eating

C. bones of my husband's body

D. bones of my husband's parents'

4.The man who brought the box nearly dropped it on his feet _____. [ ]

A. when he thought there were bones of a dead body in it

B. because he thought the bones were very expensive

C. because he thought he would break the box

D. when he knew Mr. Grey was dead

5.Which of the following is the best title for this passage? [ ]

A. Mr. Grey and His Bones

B. "My Husband's Bones"

C. The Collection of Bones

D. Treat the Box Carefully

解答题