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2.命题:“若,(a ,b∈R),则a=b=0”的逆否命题是                   (   )

     A.若a≠b≠0(a , b∈R),则≠0  

     B.若a=b≠0(a , b∈R),则≠0

     C.若a≠0且b≠0(ab∈R),则≠0  

     D.若a≠0或b≠0(a,b∈R),则≠0

试题详情

1.设集合A= ,集合B=则AB=                (   )

     A.[0,1]           B.            C.     D.

试题详情

34.-What _____dessert would he like?

   -She’d like a small one.

  A.kind       B.kinds of      C.size      D.kind of

35-Oh,I have lost my CD.

  -______Let’s call the lost and found first.

  A.Don’t shout.    B.Don’t worry.    C.Forget it.   D.No chance.

试题详情

33.-It’s hot today. Why don’t we go swimming?

  -______

   A.That’s a good idea.       B.It doesn’t matter.

   C.I don’t, either.         D.You’re welcome.

试题详情

32.      on the fact, the report should be reliable.

    A.Basing         B.To be based         C.Based      D.To base

试题详情


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