单词拼写。

1. Everybody is supposed to arrive at _____ (确切) 8 o'clock.

2. Soon the robber was found _____ (躲藏) in a mountainous village.

3. Some animals hibernate under-snow, because there is much air in _____ (松散) snow.

4. After the terrible earthquake, the whole area was e_____ destroyed.

5. Tom has got a bad cough. He s_____ a lot from it nowadays.

下列说法正确的是（　　）

A．表面有食盐水的钢铁制品露置在空气中更易生锈

B．玻璃钢、塑料都属于有机合成材料

C．在水中加入适量的乙二醇之类的化合物，可制成汽车防冻液

D．电解水实验中与电源正、负极相连的电极上产生的气体体积之比为2：1