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        1.  (2011年濰坊質(zhì)量監(jiān)測)When people cut down big trees,new trees should be planted.________they will have no trees to cut down in the future.

          A.If not                           B.If so

          C.If no so                        D.If don’t

          解析:選A。考查省略。句意:當(dāng)人們砍倒大樹時(shí),應(yīng)該種植新樹,不然的話,他們以后就沒有樹木可砍了。if not如果不,不然;if so如果這樣的話。

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