进化的主要研究内容是什么？

阅读下面短文，并做短文后的题目，从A、B、C、D四个选项中，选出能回答所提问题或完成所给句子的最佳选项。

       Steven Jobs, the designer of Apple Computer, was not clever when he was in school. At that time, he

   was not a good student and he always made troubles with his schoolmates. When he went into college,

  he didn't change a lot. Then he dropped out (退学). But he was full of new ideas.

       After he left college, Steven Jobs worked as a video game designer. He worked there for only several

   months and then he went to India. He hoped that the trip would give him some new ideas and give him a

   change in life.

       Steven Jobs lived on a farm in California for a year after he returned from India.

       In 1975, he began to make a new type of computer. He designed the Apple computer with his friend

  in his garage. He chose the name "Apple" just because it could help him to remember a happy summer he

   once spent in an apple tree garden.

       His Apple Computer was such a great success that Steven Jobs soon became popular all over the

  world.

1. Steven Jobs was not a good student in school because he _____.

A. never did his lessons

B. was full of new ideas

C. always made troubles with his schoolmates

D. dropped out

2. Steven Jobs didn't finish college, did he'?

A. Yes, he did.

B. No, he didn't.

C. Yes, he was.

D. No, he wasn't.

3. Steven Jobs designed his new computer        .

A. in India

B. with his friend

C. in an apple tree garden

D. by himself

4. Steven Jobs was popular for his _____ all over the world.

A. new ideas    

B. apple

C. Apple Computer  

D. video games

5. From this passage we know _____.

A. Steven Jobs didn't finish his studies in the college because he hated his schoolmates

B. Steven Jobs liked travelling in India and California

C. Steven Jobs liked trying new things and making his new ideas become true

D. Steven Jobs could only design video games

重症肌无力的主要临床特征为（）

A.全身骨骼肌均可无力

B.颅神经支配肌肉的无力多于脊神经支配的肌肉

C.受累骨骼肌的极易疲劳性和短时休息后好转

D.病情波动

E.感染后肌无力加重

支链淀粉中葡萄糖基通过（）糖苷键连接构成它的主链，支链通过（）糖苷键与主链连接。

健康人尿液的形成过程中，有关原尿和终尿的说法正确的是（　　）

A．原尿含大分子蛋白质，终尿内不含

B．终尿中尿素的浓度比原尿高

C．原尿和终尿都含有葡萄糖

D．等量的原尿和终尿含有等量的无机盐

新生儿病情危重而病原菌不明时易选用（）

A.庆大霉素

B.卡那霉素

C.甲硝唑

D.红霉素

E.头孢噻肟钠