我国现有法定报告传染病有（）。 A.39种 B.25种 C.37种 D.22种 E.

股票的内在价值属于股票的（）。

A.账面价值

B.理论价值

C.无面额价值

D.发行价格

关键字段的描述正确的是（）。

A.关键字段可以取空值

B.关键字段可以重复

C.关键字段既可以取空值又可以重复

D.关键字段既不能取空值又不能重复

从（）角度来说，选址不合理的开发区应考虑对规划方案做重大调整或重新选址。

A.环境影响

B.环境保护

C.生态环境建设

D.环境质量现状

写出下列各句的同义句

1. Li Ming and his parents had a good time in Shanghai last summer. 

Li Ming and his parents ________ ________ in Shanghai last summer.

2. Linda is old enough to look after herself. 

Linda is old enough to ________ ________ of herself.

3. You mustn't feed the animals in the zoo.  

________ ________ the animals in the zoo.

4. The black printer is cheaper than the other printers in the shop.

The black printer is ________ ________ of all the printers in the shop.

5. Last week, I got a letter from a friend of mine. 

Last week, I  _______    _______ a friend of mine.

其他条件不变，随产品厚度增加，单位压力是（）。

A．增大

B．不变

C．变小