17. be used to sth/ doing sth 习惯于
18. adapt to (改变以)适应 adapt oneself to 使自己适应于
adjust to (调整以)适应
19. become endangered 频临危险
20. the original species 原有的物种 species (单复数相同)
21. first of all 首先 at first; above all
22. make a big difference 大改观;影响大
23.If we know more about what causes endangerment, we may be able to take measures before it is too late. 如果我们能更多地了解致使生物濒危的原因,就能及时采取补救措施。
?They are thinking of buying the house before the prices go up. 他们正在考虑趁房价未涨时把房子买下来。
?If you don't like the present job, I suggest you look for another one before it is too late.
如果你不喜欢目前的工作,我建议你趁早另谋出路。
?He hung up before I could say a word.
我还没说一句话,他就挂了电话。
LANGUAGE STUDY
24. devote oneself to sth/doing sth 致力于
be devoted to sth/doing sth 投身于
a devoted friend / wife
25. at present 目前 at the present time
be present at 出席
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