Ⅰ. 用本单元所学单词填空
1. the danger of shipwreck 船只失事的危险
2. a 12. 7millimetre rapid-fire machine gun 一只12. 7毫米口径的速射机关枪
3. a notable success 显著的成功
4. an ice-like substance 一种像冰的物质
5. deep-sea drilling 深海钻探
6. a criminal investigation 一次刑事调查
7. retreat back down the mountain 向山下撤退
8. with the palms facing upwards 掌心向上
9. delve into her mother’s past 探究她母亲的过去
