句型转换。

1. My sister is a very lovely girl. (感叹句)

    _______ _______ _______ girl my sister is!

2. What else did you buy yesterday? (同义句转换)

    What _______ _______ did you buy yesterday?

3. He is the tallest student in the class. (同义句转换)

    He is _______ _______ _______ _______ student in the class.

4. I think he is a good student. (改否定句)

    I _______ _______ he _______ a good student.

5. I go to Beijing twice a year. (对画线提问)

     ______ ______ ______ you go to Beijing?

下列说法中，不正确的是

A．用蒸馏法能从海水中提取淡水

B．从海水中可以得到氯化镁，再加热分解可制金属镁

C．用氯气从海水中提溴的关键反应是Cl₂+2Br^－= 2Cl^－+Br₂

D．煤的气化主要反应是