27. The colors on the national flags can be ______ differently in different cultures, but they have one thing in common, that is, ______of the colors was carefully chosen.
A. translated; every B. explained either
C. represented; all D. interpreted; each
26. I always have so many things to____ when I come back to the company after a trip abroad.
A cater to B contribute to C attend to D appeal to
25. Cars play an important role in modern life, but they ______ also cause many problems like air pollution.
A. should B. can C. must D. will
24. Some old people don’t like pop songs because they can’t _____so much noise
A. concern B. tolerate C. undertake D. ignore
23. She is well thought of by all her workmates because she is ______ towards others.
A. considerate B. arbitrary C. conservative D. straightforward
22. -What did the professor ask us to do just now?
-Sorry, I about my trip to the Wolf Hill at the weekend.
A. had thought B. thought C. think D. was thinking
第一节:单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21. Without _____thorough understanding of China’s specific conditions, you can’t have ______ say over the only-child policy.
A. a; the B. the; a C. a; a; D. the; the
28.(9分)
向体积为10 L的固定密闭容器中通入3 mol X气体,在一定温度下发生如下反应:
2X(g) Y(g)+3Z(g)
(1)经5min后反应达到平衡Ⅰ,此时测得容器内的压强为起始时的1.2倍,则且Y表示的反应速率为 mol/(L·min);
(2)若上述反应在甲、乙、丙、丁四个同样的密闭容器中进行,在同一段时间内测得容器内反应速率分别为:甲:丙:。若其它条件下同,温度不同,则温度由高到低的顺序是(填序号) ;
(3)若向Ⅰ的平衡体系中充入氮气,则平衡 (填“向左”或“向右”或“不”)移动;若将Ⅰ的平衡体系中部分混合气体移走,则平衡 (填“向左”或“向右”或“不”)移动;
(4)若在相同条件下向Ⅰ的平衡体系中再充入0.5 mol X气体,则原平衡Ⅰ中X的转化率与重新平衡后X的转化率相比较 (选填字母)。
A.无法确定 B.前者一定大于后者
C.前者一定等于后者 D.前者一定小于后者
(5)若保持温度不变,起始时加入X、Y、Z物质的量分别为a mol、b mol、c mol,达到平衡时各气体体积分数与Ⅰ平衡相同,且起始时维持化学反应向逆反应方向进行。则c的取值范围应该为 。
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