适筋梁正截面受力分析中，承载能力极限状态计算的依据在第（）阶段。

A．1

B．2

C．3

D．4

写出下列各句的同义句。（共5小题；每空一词各0.5分，满分5分）

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.