27. The watch unnoticed for several days I found it.
A. had laid; before B. lay; after C. had lain; before D. laid; until
26. If Sanlu Group melamine to the milk, the babies too much from kidney stone.
A. didn’t add; would not suffer
B. hadn’t added; wouldn’t have suffered
C. hasn’t added; wouldn’t have suffered
D. hadn’t added; would have suffered
25. - How do you deal with the disagreement between the company and customers?
- The key the problem is to meet the demand by the customers.
A. to solving; making B. to solving; made
C. to solve; making D. to solve; made
24. - Look! It again.
- Yes. This in the third rain we this month.
A. will rain; shall we B. is raining; have had
C. rains; had D. is going to rain; have had
23. The H1N1 flu is spreading across the world at a frightening rate, with thousands of people every day.
A. to be infected B. be infected C. been infected D. being infected
22. The Roma originally lived in India in is now Pakistan.
A. northern; when B. north; which
C. northern; what D. north; in which
34.(7分)某小组在完成探究“温度是否会影响酶的活性”这个实验后提出一个问题:“酶活性受温度影响示意图”是否真的如教材所示,呈规则的、左右对称的抛物线呢?希望通过定量实验进行探究。以下是小组内同学们的讨论:
甲同学提出:可通过测单位时间内反应物的消耗量来测定酶的反应速率;
乙同学提出:先用酒精灯加热来制造高温条件,用排水法记录反应速率,实验装置如图1;
丙同学指出乙同学提出的实验方案有不合理的地方,温度过高酶会失活。他经过重新思考,定出了新的实验方案:先让酶由低到高预热成系列温度梯度,并与之相对应地加入过氧化氢,用排水法记录反应速率,实验装置如图2。
请回答:
(1)你认为甲同学的方案是否可行? ,因为 。
(2)小组采用了丙同学的实验方案,用系列温度梯度进行实验,得出不同温度下的反应速率,结果见下表:
请你根据上表数据,在坐标图中绘出酶活性受温度影响的曲线图。
(3)若用新鲜土豆研磨液代替上述新鲜猪肝研磨液,能否会出现
上述表格中类似的数据? 。
(4)以上实验说明酶的催化作用需要 。
(5)本实验得出的结论是 。
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