19. Many types of animal have now ______ the earth, which has aroused greatest attention by scientists.[ 1分] b
A.vanished fromB.vanished intoC.been vanishedD.vanished of
* 20. I can't walk 10 miles; I know my own ______.[ 1分] a
A.conditionsB.resourcesC.limitsD.identities
* 56. Identify the errors in the following sentences: Do you know anybody who had been injured in the accident happened on the street yesterday.[ 1分] a
A.anybodyB.inC.happenedD.on
* 21. Identify the errors in the following sentences: Not until mid-night the electricity service was restored.[ 1分] ac
A.Not untilB.mid-nightC.the electricity service wasD.restored
* 22. The old couple in this flight took ______ window seats and helped themselves.[ 1分] c
A.overB.backC.inD.out
* 23. Do you think that these new methods will _____?[ 1分]
A.runB.operateC.workD.act DD

19.A vanish from是词组，从。。。消失
20.A 表示身体状况
56.D happen on 后面跟的是某人，这里是在哪里发生的
21.C 主语the electricity service 不适合用被动语态
22.A take on 开始雇用；呈现，具有；同…较量，接受…的挑 战；承担，从事
take over 接受，接管；借用，承袭
23C work这里是起作用，生效的意思