1 . Variety in diet and toys, travel, and ________ (expose) to new people and places all help to make your bird more flexible and adaptable to change. (所给词的适当形式填空)

3 . 拓展单词
1. crime n. 罪，罪行→________ adj.犯罪的n.罪犯
2. greed n. 贪婪，贪心→________ adj.贪婪的，贪心的
3. commit v. 犯(错误或罪行)→________ n. 不得不做的事；承诺
4. estimate v. 估计，估算→________ n. 估计，判断
5. restrict v. 限制，控制→________ n. 限制，控制
6. optimistic adj.乐观的；乐观主义的→________ adv.乐观地；乐观主义地
7. terrify vt.使恐惧，使十分害怕，使惊吓→________ adj.极其可怕的，骇人听闻的→________ adj.恐惧的；受惊吓的
8. expose v. 使暴露(于险境)→________ n. 暴露，揭露

5 . 出国留学时，我们会身处一种外语环境，这使得学习过程有趣且有效。(exposure; make) (汉译英)
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9 . 英汉互译

1. microscope ________________
2. mosquito ________________
3. maintenance ________________
4. cast new light on ________________
5. creature ________________
6. circumstance ________________
7. 在这种情况下，既然如此 ________________
8. adj. 看得见的；明显的________________
9. n. 辐射，放射线________________
10. n. 面临，遭受；揭露；报道________________