下列实验中，能证明苯酚的酸性极弱的是 [ ]

A．跟氢氧化钠溶液反应生成苯酚钠

B．跟FeCl₃溶液作用显紫色

C．二氧化碳通入苯酸钠溶液能产生苯酚

D．常温下苯酚在水中溶解度不大

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.