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27. Some people think clowns are only funny for children. _____________ , they can help people forget their problems, at least for a short moment.

   A. Actually     B. Especially     C. Probably      D. Surely

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26. A smile can help us _____________ difficult situations and find new friends in a world of strangers.

  A. get across     B. get through        C. get out         D. get off

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25. We should all remember that some great scientific discoveries _____________ by chance.

  A. gained       B. discovered       C. occurred       D. earned

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24. I had only a few _____________ with Miss Gao, though we work in the same school.

  A. laughter       B. handshakes       C. amusement      D. contacts

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23. In case it thunders, we’d better _____________ the electricity at once and turn off the TV.

  A. cut in      B. cut off         C. cut down      D. cut away

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22. He is such a _____________ teacher that he knows what his students need.

  A. practical     B. humorous       C. mild            D. typical

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第一节: 多项选择 (共10小题;每小题1分,满分10分)

从A、B、C、D四个选项中,选出可填入空白处的最佳选项,并在答题卡上将该项涂黑。

21. Captain James Cook took _____________ of the islands in 1769 and from that time British people started to settle in New Zealand.

  A. notice      B. hold          C. possession      D. care

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28、(15分)2 L容器中,分别将物质的量

均为2.00 mol的SO2、O2混合,在不同温度(T)

下发生如下反应:2SO2(g)+O2(g)    2SO3(g)。并

在第10 s时分别测定其中SO3的体积分数(SO3%)

并绘成如图所示曲线:

(1)此反应的正反应为     热反应;

(2)A、B两点正反应速率的大小关系是:vA   vB(填=、>或<,);以O2表示T0对应的平均反应速率(O2)=       

(3)温度T<T0时,SO3%逐渐增大的原因是                  

                                

(4)若B点SO3的体积分数为40.0%,则SO2的转化率为     (保留3位有效数字);

(5)若将B点的混合气体的5%通入过量的BaCl2溶液,生成沉淀    g。(保留3位有效数字)

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