机房内必须备有紧急消防设备,并指定专人负责()进行检修。
A、每天
B、偶尔
C、定期
D、不定期
参考答案:C
用所给词的正确形式填空。
1. If those wild animals can't find enough food, they ______ (die)
or have to leave their habitat soon.
2. You must try your best to stop him ______ (make) the same mistake again.
3. We should do everything we can ______ (protect) the environment.
4. I found that many people ______ (lie) on the beach when I arrived there.
5. The boy sat down excitedly because he answered the difficult question ______ (correct).
6. Many wild animals face the problem of the ______ (lose) of living areas.
7. —Would you mind ______ (give) your seat to the old man?
—Of course not.
8. Laura ______ (learn) another language next year, isn't she?
9. A terrible snowstorm ______ (hit) the city early this morning.
10. All the drivers have to drive slowly and carefully because of the _____ (fog) weather.
乔木树种的生活型为()。
A.地面芽植物
B.地上芽植物
C.地下芽植物
D.高位芽植物