把一小块金属钠投入到饱和石灰水中，不会出现的现象是

A．溶液中出现白色浑浊物

B．有金属钙被还原出来</PGN0014B.TXT/PGN>

C．反应过程中易发生爆炸

D．钠熔化成小球在液面上迅速游动

句型转换。

1. There is a tree in front of the classroom. (改为一般疑问句并作否定回答)

    ______ ______ a tree in front of the classroom?

    No, ______ ______.

2. There are some offices in the hospital. (改为否定句)

    ______ ______ ______ offices in the hospital.

3. There are twenty computers in the room. (对划线部分提问)

     ______ ______ computers are there in the room?

4. The TV is in my room. (对划线部分提问)

     ______ ______ the TV?

5. The science lab is behind the library. (改为同意句)

    The library is ______ ______ ______ the science lab.