Many scientists believe that global warming , if ______ , will cause extreme climate changes this century .

试卷相关题目

• 1_______, I'd have told you.

  A.If I would have known

  B.If I had have known

  C.Had I known

  D.Should I know

  开始考试点击查看答案
• 2________ a beautiful palace ________ the foot of the hill.

  A.There stand; at

  B.There stands; under

  C.Stands there; under　

  D.There stands; at

  开始考试点击查看答案
• 3______earlier, I' d have told you.

  A.If I would have known it

  B.Had I known it

  C.If I knew it.

  D.Should I know it

  开始考试点击查看答案
• 4So loudly _____ that ____ hear her clearly.

  A.did she speak; could everyone　

  B.did she speak; everyone could

  C.she spoke; could everyone　

  D.she spoke; everyone could

  开始考试点击查看答案
• 5Patrick has never learned a foreign language, ______ .

  A.nor does he think he has to

  B.neither he thinks he has to

  C.he thinks he has not to ,either

  D.he doesn't think he has to

  开始考试点击查看答案
• 6In a chemical change, energy cannot be created ,_______.

  A.nor can it be destroyed

  B.not it be destroyed

  C.so can't it not be destroyed

  D.either it cannot be destoryed

  开始考试点击查看答案
• 7Only when the meeting was over ______ go back to meet his friend.

  A.he could　

  B.he was able to　

  C.was he able to

  D.was able to he

  开始考试点击查看答案
• 8Never_______Lisa would arrive but she turned up at the last minute.

  A.did we think

  B.have we thought

  C.we thought

  D.we have thought

  开始考试点击查看答案
• 9Only in recent years ______ to realize the importance of wildlife conservation.

  A.do people begin

  B.have people begun

  C.people have begun

  D.people begin

  开始考试点击查看答案
• 10Not only_______know the theory, but also_______learn how to apply it in practice.

  A.should we; should we

  B.we should; we should

  C.should we; we should

  D.we should; should we

  开始考试点击查看答案