正常人红细胞制造场所是在 A．肝脏 B．脾脏 C．肾脏 D．骨髓 E．淋巴结

阅读理解。

     George Stephenson (乔治· 史蒂芬孙) 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 took one to pieces and studies each

piece carefully. Soon he became a very good worker though he could not read or write. He began to

learn the 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 many things in his life. The train was

the greatest one among them. Today when we watch of 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 taking 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. ________ was invented by George Stephenson.

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

阳水水湿浸渍的治法是（）

A.化湿清热利水

B.化湿利水，补脾益气

C.运脾化湿，通阳利水

D.益气健脾，行气运湿

E.温运脾阳，以利水湿

小涵同学为测定某氯化钡溶液中溶质质量分数，取实验室现有含钾元素50%的碳酸钾和硫酸钾的混合物7.8克与100克氯化钡溶液充分混合后，恰好完全反应，则该氯化钡溶液中溶质质量分数为[ ]

A.5.2%

B.15.6%

C.20%

D.10.4%

可控硅元件有什么特点？并述其导通条件。

有关婚前指导，以下不恰当的是（）。

A.有关性卫生的保健和教育

B.新婚避孕知识和计划生育知识

C.受孕前的准备，环境和疾病对后代影响等孕前保健知识

D.性病的基本知识

E.影响婚育关系的基本知识