非职务育种

阅读理解。

     George Stephenson was born in 1781 in a poor family. He had to start work when he was only eight.

When George was fourteen, he became his father's helper. He spent a lot of time learning about engines

(发动机). And on holidays he often make one engine to pieces and studied each piece carefully. Soon he

became a very good worker though he could not read or write. He began to learn English letters when he

was seventeen years old. Every day after he did twelve hours of hard work, he walked a long way to have

lessons from a young school teacher. On his eighteenth birthday, he wrote his own name for the first time

in his life. George invented (发明) many things in his life. The train was the greatest one among them.

Today when we take trains from one place to another, we'll think of this great man---George Stephenson.

1. In which year did George Stephenson start to help his father?

A. In 1781

B. In 1789

C. In 1795

D. In 1798

2. He learned about the engine ________.

A. through reading and writing

B. by making it to pieces and studying each piece carefully

C. at lessons from a young teacher

D. by asking a lot of questions

3. He spent a lot of time learning about engines and soon he became ________.

A. a great man

B. a good maker

C. a good worker

D. a good student

4. George Stephenson invented the ________.

A. the train

B. the telephone

C. the car

D. the computer

5. From the passage we know George Stephenson was one of the greatest ________ in the world.

A. workers

B. writers

C. learners

D. inventors

男性，60岁，近3年食欲轻度减退，疲乏无力，1个月前体检发现下肢浮肿及少量腹水。2天前突然呕吐暗红色液体2次，约500ml，今解柏油样便3次，约600ml。可能诊断

A．胃癌
B．贲门黏膜撕裂综合征
C．消化性溃疡
D．食管癌
E．应激性溃疡

高聚物分子量分布的测定方法有（）。

A.溶解度分级法

B.凝胶渗透色谱法

C.溶胀度法

D.共振法

A船航行在太平洋，其B站识别码为341219009，B船航行在印度洋，其移动站识别码为341219008，A船欲使用B移动站通过缺省地面站同B船进行电传通信，则号码组成为（）。

A、00873341219008

B、00583341219008

C、00872341219009

D、00582341219008

反渗透进水余氯：（）。