Where are their teeth?螃蟹的牙齿长在哪儿？

（ ）1. The teeth of a crab are__________.

A. in its claws B. on its shell

C. in its stomach（胃）

（ ）2. How do crabs walk？

A. They walk sideways（向一旁）.

B. They walk backward（向后）.

C. They walk forward（向前）.

（ ）3. The__________of a crab can grow back.

A. head B. claws（爪子） C. eyes

（ ）4. The abdomen（腹部）of a female（母的）crab is .__________The

abdomen of a male（公的）crab is__________.

A. round， narrow（窄的）

B. narrow， round

C. round， round

（答案請见P48）