设NA为阿伏加德罗常数的值。如果ag某气体中含有的分子数为b，则cg该气体在标准

—I am trying my best to learn English, but it doesn’t work well!

—Don’t worry! Regard it _____ a big challenge!

A．to

B．with

C．for

D．as

阅读理解。

    Like most July days, it was hot. I stepped into a tiny ice-cream shop to cool off with a chocolate ice-cream.

It was an old-time store with little round tables and chairs.

    As I entered, I found a very old woman bent over a table near the door. Her back was so badly twisted by

some sadness that her face nearly touched the table top. I sat down facing her a couple of tables away.

     "Poor woman," I thought, "what does she get out of life? Why God let people live so long past their prime

(盛年)?"

     As I thought, another aged lady entered the shop and sat down with her. Soon the two of them were talking

about childhood days. They talked of how little the shop had changed in 70 years ……In minutes, the two of

them were trembling with laughter. I looked again at the first woman, then in the mirror on a nearby wall,

catching a picture of myself.

     I was wearing a dirty shirt.

     She was well dressed in white, her hands sparking with gold rings.

     I was gloomy (愁闷的) 

     She was laughing, smiling.

     I sat alone. 

     She was sharing the day with a good friend.

     I was secretly worried about getting old

     She was old, but it wasn't hurting her.

     As I left the shop, I thought of my foolish question about God letting people live past their prime. Why,

that woman was more alive, more sensitive (敏感的) to life than I was. Age has not bent her spirit.

1. Which of the following is the main idea of the passage?[ ]

A. To tell us the life of old people.

B. To show the difference between the old and the young.

C. To show that old age does not mean doing short of spirit.

D. To make the reader have a pity on the old people.

2. The writer implies all of the following except that _____. [ ]

A. the old lady was very lonely and sad

B. he had more problems than the old lady

C. the old lady had lived a full and satisfying life

D. the old lady had learned to enjoy the simple things in life

3. Which of the following is the conclusion the writer made about the old lady?[ ]

A. She was to be pitied for her old age.

B. She considered the young man pitiable.

C. She was more alive and sensitive to life than the writer.

D. People should not be allowed to live when they are too old.

一个平太阳日与一个恒星日之间的关系为（）。

A．两者相等

B．一个平太阳日比一个恒星日长3m56s.56

C．两者无关

D．一个平太阳日比一个恒星日短3m56s.56

急性脊髓压迫症减压应在（）

A.24小时内

B.18小时内

C.12小时内

D.6小时内

E.3小时内

小脑幕切迹疝的主要临床表现为（）

A.血压下降，脉缓，呼吸不规则

B.癫痫大发作

C.腰穿脑脊液压力增高

D.头痛、呕吐、意识障碍，患侧瞳孔扩大，对侧肢体瘫痪及病理反射阳性

E.呼吸突然停止，血压下降，很快死亡