题目:
用所给动词的适当形式填空。
1. He can _____________ (catch) the ball.
2. They usually _____________ (teach) each other.
3. Jenny often _____________ (buy) some things at the store.
4. We _____________ (go) to a little store this morning.
5. You _____________ (have) fun today.
6. He _____________ (be) a good basketball player.
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:蚯蚓呼吸的是空气中的氧气,氧气先溶解在体壁的粘液里,然后渗透到体壁内的毛细血管中的血液里,血液中的二氧化碳也通过体壁排出体外.因此蚯蚓是用湿润的体壁进行呼吸的.故在实验过程中,蚯蚓...