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第一节   单项填空(共15小题;每小题1分,满分15分)

从所给的四个选项中,选出最佳选项,并标在试卷的答题卡上

1. It is quite obvious that the aging population in China will cause _____heavy pressure on _____whole society in near future.

A. a; a     B. a; the      C. the; a        D the, \

2 The great difficulty I had _____ the patient who received a serious wound was unimaginable.

A. treat    B. to treat           C. treating           D. treated

3  With all these dishes ______, I can't go and listen to the speech by the famous professor.

A. to wash     B. to be washed      C. washed        D. washing

4  There is a saying , “life is 10% ______ happens to us and 90%____ we respond to it.”

A.who; why           B.what; how      C.which; when        D.that; that

5  Noticing some broken toys ______ on the floor, I picked them up and ______ them on the chair, so I wasn’t _____.

A. lay; lay; lying ;       B. lying; lay; lying;       C. laid; laid; laying;     D. lying; laid; lying;

6  --I’m sorry, I shouldn’t have been so rude to you.

 ---You ________ your temper , but that’s OK.

A. have lost   B. had lost        C. did lose   D. were losing

7  What impressed me most in 2008 was the success of Shenzhou VII and China’s becoming the third nation to send a man into space, ________ all our Chinese are proud.

A. of which      B. for which     C. of that      D. for it

8 We strongly _____ your decision to go abroad at this time of danger. It is not a wise decision.

A. approve  B. insist  C. oppose  D. appreciate

9 The birds, ______ by the presence of the scientists, disappeared really quickly again.

A. frightened    B. being frightened  C. have been frightened    D. were frightened

10 Everybody present at the meeting agreed to stick to the ______ that everyone should be treated fairly.

A. purpose      B. ambition         C. principle     D. level

11  Can you think of some cases _________ drivers obviously knew the traffic rules but didn’t obey them?

A.why         B.where        C.as        D.which

12 -________ matters to do the job well -what you are or where you come from?

    -Neither. It depends on whether you put your heart into it.

A.Which is it that      B.What it is that

C.Which it is that      D.What is it which

13  -How shall we do the scientific research?

     -________, we’ll have to gather concerned information as much as possible.

A.After all  B.To begin with    C.In other words   D.To be frank

14  -- Isn’t it Ann’s husband over there?

   ---- No, it ______ be him---I’m sure he doesn’t wear glasses.

A. can’t     B. must not     C. won’t     D may not

15 - Ring me at six tomorrow morning, will you?

- Why that early? I ______ .

 A. will be sleeping  B. have slept       C. have been sleeping  D. will sleep

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5、某人在以a=2m/s2匀加速下降的电梯中最多能举起m1=75kg的物体,则此人在地面上最多可举起多大质量的物体?若此人在一匀加速上升的电梯中最多能举起m2=50kg的物体,则此电梯上升的加速度为多大?

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4、一个人站在磅秤上,在他蹲下的过程中,磅秤的示数将(  )

    A、先小于体重后大于体重,最后等于体重。

    B、先大于体重后小于体重,最后等于体重

    C、先小于体重,后等于体重

    D、先大于体重,后等于体重

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3、如图所示,在两块相同的竖直木板之间,有质量均为m的4块相同的砖,用两个大小均为F的水平力压木板,使砖静止不动,则第2块砖对第3块砖的摩擦力大小为  (    )

    A.0     B. mg    C.mg/2    D.mg/4

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2、如图所示,电灯悬挂于两墙之间,更换绳OA,使连接点A向上移,但保持O点位置不变,则A点向上移时,绳OA的拉力(   )

    A.逐渐增大  B.逐渐减小 C.先增大后减小  D.先减小后增大  

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1、如图1所示,长为5m的细绳的两端分别系于竖立在地面上相距为4m的两杆的顶端A、B ,绳上挂一个光滑的轻质挂钩,其下连着一个重为12N的物体,平衡时,问:

①绳中的张力T为多少? 10N

②A点向上移动少许,重新平衡后,绳与水平面夹角,绳中张力如何变化?不变

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例1、城市中的路灯,无轨电车的供电线路等,经常用三解形的结构悬挂。图为这类结构的一种简化模型。图中硬杆OB可绕通过B点且垂直于纸面的轴转动,钢索和杆的重量都可忽略。如果悬挂物的重量为G,角AOB等于θ,钢索OA对O点的拉力和杆OB对O点的支持力各是多大?

例2、举重是中国代表团在奥运会上重要的夺金项目。在举重比赛中,运动员举起杠铃时必须使杠铃平衡一定时间,才能被裁判视为挺(或抓)举成功。运动员可通过改变两手握杆的距离来调节举起时双臂的夹角。若双臂夹角变大,则下面关于运动员保持杠铃平衡时手臂用力大小变化的说法正确的是(C )

    A.不变   B.减小    C.增大      D.不能确定

例3、人站在电梯中,人的质量为m。

①人和电梯一同静止时,人对地板的压力为多大?

②人随电梯以加速度a匀加速上升,人对地板的压力为多大?

③人以加速度a匀减速下降,这时人对地板的压力又是多大?

④人随电梯以加速度a(a<g)匀加速下降,人对地板的压力多大?

⑤人随电梯以加速度a(a<g)匀减速上升,人对地板的压力为多大?

⑥人随电梯以加速度g匀加速下降,这时人对地板的压力又是多大?

例4、在一个封闭装置中,用弹簧秤称一物体的重量,根据读数与实际重力之间的关系,以下说法中正确的是(  C  )

    A.读数偏大,表明装置加速上升

    B.读数偏小,表明装置减速下降

    C.读数为零,表明装置运动加速度等于重力加速度,但无法判断是向上还是向下运动

    D.读数准确,表明装置匀速上升或下降

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