Ⅰ.单词拼写
1．Scientists do not know how much and what kinds of noises are harmful (有害的) to ocean animals.
2．Mammals exist (存在) when the animals that were harmful to them disappeared.
3．Hand washing can prevent (阻止) the spread of many infections (感染)．
4．In his book, he explained the operating theories (理论) of computers in detail.
5．Man can't live without oxygen (氧气)．
6．The younger generation tell me that religion (宗教) is “old hat” and science has proved this.
7．These computers are a puzzle (难题) to me.
8．With so many problems arising, the system (制度) should be improved.
9．Thirtyone people have been injured in violent (暴力的) incidents throughout the day.
10．As is well known, fresh air is fundamental (基本的) to good health.
