5.3 从刚才背过的单词中选出最适当的填入空格内.(注意时态哟)

1. A(n) ( ) feeds its young with milk from the breast.

2. Detectives ( ) crimes to find out who dis them.

3. In the backyard I saw many hens ( ) at the corn.

4. If a thing is in ( ), it is not at rest.

5. Many people ( ) building a new highway because of cost.

答案和翻译：
1 A(n) (mammal) feeds its young with milk from the breast. 哺乳动物用乳房里的奶喂养自已的孩子.

2 Detectives (investigate) crimes to find out who did them. 侦探调查罪犯为了找出是谁做的.

3 In the backyard I saw many hens (pecking) at the corn. 在院子里我看到很多母鸡在啄谷子.

4 If a thing is in (motion), it is not at rest. 如果一个物体在动,他就不是静止的.

5 Many people (opposed) building a new highway because of cost. 很多人反对建新的高速工路是因为成本问题.