1. (2018八下·兴义期中) 阅读下文，回答问题

    Can plants learn and remember? Monica from Australia thinks so.

    Monica and her team members did some tests on mimosas(含羞草). The plants close their leaves quickly when people touch them. They put some mimosas in 56 pots. Every time they dropped the pots from 30cm high, the plants closed their leaves. Monica and her team members did this for a whole day. To their surprise，at the end of the day, the plants didn't close their leaves at all. It seemed that the plants learned that this action wouldn't hurt them.

    Another amazing thing was that the plants might remember things for a long time. Monica dropped the same pots of mimosas four weeks later. The plants still didn't close their leaves.

    Monica wasn't sure how plants learned and remembered. "The plants don't have brains, after all. Maybe they learn and remember with the help of their cells(细胞)," she said.

1. （1） When mimosas are touched, ___________.

   A . they make some sounds B . they open their leaves C . they close their leaves D . their leaves drop
3. （2） How long did it take Monica to do the test at first?

   A . Two days. B . One day. C . Half a day. D . Three hours.
5. （3） What did Monica find four weeks later?

   A . The plants didn't close their leaves. B . The leaves of the plants dropped. C . The plants grew more leaves. D . The plants closed their leaves.
7. （4） The underlined word "brain" means "_______"in Chinese.

   A . 血液 B . 心脏 C . 大脑 D . 智慧
9. （5） What can we learn from the text?

   A . Mimosas aren't easy to keep. B . Monica likes mimosas a lot. C . Plants have brains. D . Some plants can remember things.