问题 选择题

(2011年湖南怀化,1题)下列物质中属于纯净物的是

A.纯净的空气

B.烧碱

C.75%的医用酒精

D.矿泉水

答案

答案:B

纯净的空气中含有氮气、氧气、二氧化碳、稀有气体等多种成分,属于混合物;烧碱是氢氧化钠的俗名,属于纯净物;75%的医用酒精是酒精的水溶液,属于混合物;矿泉水中溶解着多种对人体有益的矿物质,属于混合物。

阅读理解

阅读理解。

    When a close friend dies, it often forces you to consider your own death. The more you have in

common with the friend, the more his death will make you wonder about your own. Sometimes you

will naturally say to yourself, "it could just as easily have been me." Such a death has a way of reminding

us how fragile life is, and it may cause you to reassess (重新评价) the direction of your own life.

    Jack's story is a good example. A successful businessman making a lot of money, Jack didn't spend

as much time with his family as he wanted. His job required him to work long hours. But three years

ago one of his best friends, a man who worked in the same office, had a heart attack. He died while

celebrating his daughter's eighteenth birthday in a restaurant. He was only fifty years old.

     Not long after his friend's death, Jack started to have a chest pain. Finally he had a good physical

check-up. He received a clean bill of health. But the chest pain continued. He kept thinking of the death

of his friend. Jack thought about how much his friend missed in life and he saw how hard it was for his

friend's family to manage after he passed away.

     Jack realized that he didn't want to end up his life that way. He talked his feelings over with his wife

and children, and decided to change his way of life. The family moved to a small town where he stared

a simple life. Now he is running a small art gallery. He is relaxed, and says he has never been so happy in

his life. And he has got no more chest pain.

1. According to the passage, a man's close friend's death is ______ to him. [ ]

A. common

B. a warning

C. an example

D. a direction of life

2. Jack didn't spend much time with his family because he ______. [ ]

A. didn't want to be with them

B. he had too much money

C. he had to work with his best friend

D. he was too busy

3. The word "missed" in the passage means ______ in Chinese. [ ]

A. 想念

B. 回忆

C. 错过

D. 创造

单项选择题