用所给单词的适当形式填空。

1. After the earthquake _______( home)  people had nothing to eat.

2. They started at six in the morning and arrived there three hours _______(late) .

3. Which is the _______ ( easy) way to get round the city?

4. The people of that country suffer from_______( hungry) .

5. My parents _______( clean)  the house at eight yesterday morning.

凹界面反射一般在深层为（）

A、平缓型

B、聚焦型

C、回转型

D、直线型