儿童慢性胃炎炎症程度的区分根据是（） A.胃镜下改变 B.炎症累及胃黏膜的深浅 C.

阅读理解。

     February 11th is the birthday of the most famous American inventor, Thomas Alva Edison.

Edison was born in 1847. He was not a good student when he was a young boy. His teacher said

he was one of the most dumb headed(笨头笨脑的)students. He did badly in many subjects and

left school after only three months. So his mother took him home and taught him herself. Edison

didn't like school at all, but he loved science. He liked to ask questions.

     One day his father found him sitting on some eggs. His father asked him why. The boy didn't

answer. He asked his father instead, "Why can't I hatch(孵化)chickens, but hens can?"

     Edison invented 1328 things in his life, and these things made our lives more comfortable(舒适的)

and the world more beautiful. People will never forget him.

1. Edison was born _____.

A. in winter

B. one hundred years ago

C. in Canada

D. in January 

2. Edison's teacher said _____.

A. he was one of the cleverest boys

B. he was a good student

C. he was not a good student

D. he could learn many things

3. Edison's mother _____.

A. taught him at home

B. taught him at school

C. was a teacher

D. took him to another school

4. One day Edison sat on some eggs. He _____.

A. liked to sit there

B. wanted to break the eggs

C. wanted his father to look for him

D. wanted to hatch chickens

5. We now know Edison _____.

A. was a good student

B. was a dumb headed student

C. was very clever

D. wasn't famous

实验室制取下列气体：①用双氧水和二氧化锰制取氧气；②用石灰石和稀盐酸制取二氧化碳气体；③用锌和稀硫酸制取氢气．下列有关说法错误的是

A．都可用澄清石灰石检验该气体

B．①和③可用排水法收集气体

C．都不需要对气体发生装置加热

D．都可以用相同的发生装置

下列气体指标的控制方式中，适用于对乙烯敏感的产品的是（）。

A、双高指标

B、双低指标

C、氧单指标

D、多指标

要降低杆塔接地电阻可采取什么办法？

当归六黄汤中用量最大的药物是（）

A.黄连

B.黄柏

C.熟地黄

D.生地黄

E.黄芪