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4.下列函数中,在区间上为增函数的是(   )

  A.         B.          C.      D.

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3.已知向量ab ,则向量a+b所在的直线可能为(   )

  A.轴                              B.第一、三象限的角平分线

C.轴                              D.第二、四象限的角平分线

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2.复数的虚部是(  )

  A.              B.              C.         D.

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1.集合,集合,则的关系是(  )

  A.           B.          C.       D.

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50.It’s ______ to borrow money from your mother to settle your debt to your uncle. That’s just robbing Peter to pay Paul.

A.ridiculous      B. strange      C. stubborn    D. splendid

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49.Everything works out well. ____, we are sure that the experiment will be completed on time.

A.Therefore       B. While      C. However      D. Otherwise

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48.Although my grandfather is in his eighties, he is still as ______ as a young man and hates sitting around doing

nothing all day.

A. enthusiastic      B. automatic    C. energetic      D. innocent

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47.He was robbed last night, but     he didn’t have much on him then.

A.fortunately        B.eventually        C.certainly         D.surprisingly

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46.Letterboxes are much more ____ in the UK than in the US, where most people have a mailbox instead.

A. common      B. normal     C. ordinary     D. usual

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45.After I arrived at her house, she showed me into ____________.

A. a room cosy or little    B. a little cosy room   C. a cosy little room   D. cosy little a room

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