看看你的应变能力，用所给单词的适当形式填空。

1.Which one do you like ______ (much), the first one, the second one or the third one?

2.Can you tell me the ______ (mean) of the word?

3.I think "united"______(mean) "together".

4.Look! They're ______(talk) to each other on the phone.

5.They come from ______. They speak _____ (French).

6.It's the main language _____ (use) at the UN.

下列描述中，属于煤层厚度后生变化的是（）。

A.河流冲蚀

B.构造变动

C.沉积基底抬高

D.岩溶

E.沉积时期