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
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
25. We should all remember that some great scientific discoveries _____________ by chance.
A. gained B. discovered C. occurred D. earned
24. I had only a few _____________ with Miss Gao, though we work in the same school.
A. laughter B. handshakes C. amusement D. contacts
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
22. He is such a _____________ teacher that he knows what his students need.
A. practical B. humorous C. mild D. typical
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
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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