29. He made another wonderful discovery, ______ of great importance to science.
A. which I think is B. which I think it is
C. which I think D.I think which is
28. Was it through Mary,_____ was working at a high school, ____ you got to know Tom?
A.who; who B. that; which C. who; that D.who; which
27. Every time Ashtita tries to break a record, he reaches a point ______ he feels he cannot physically do any more.
A.where B.that C. when D. which
26. The boy talked his mother ________ buying him a home computer.
A. of B. over C. to D. into
25. When ______ about the secret of his success, Steven Spielberg said that he owes much of his success and happiness ________ his wife and children.
A. asking; to B. asked; in C. asked; to D. asked; about
23. The audience ______ when they heard the humorous story.
A. burst into laughing B. burst out laughter
C. burst into laughter D. burst in laughing
24 To enjoy the scenery, Sara would spend long hours on the train ______ travel by air.
A. as to B. other than C. instead of D. rather than
22.一I’m sorry.That wasn’t of much help.
-Oh,_______ .As a matter of fact,it was most helpful. A.sure it was B.it doesn’t matter C.of course not D.thanks anyway
第一节 单项填空(共15小题,每小题1分,满分15分)
21.The restaurant was on__ _fire and the people burnt in the fire were taken to___ _ hospital.
A. the; / B. /; / C. the; the D./; the
50.(7分)通过探究酵母菌细胞呼吸的方式,可以了解细胞呼吸的类型。
材料用具:液体石蜡油、质量浓度为0.1g/mL的葡萄糖溶液酵母培养液、保温瓶、温度计、棉花等,设计活动程序:
① 取二只保温瓶,编号为A、B,如右图;
②A瓶注入煮沸的质量分数为0.1g/mL的葡萄糖溶液1L;B瓶注入未经煮沸的质量分数为0.1g/mL的葡萄糖溶液1L;
③向A、B瓶中分别加入等量的酵母培养液;
④向A号瓶中注入液体石蜡;
⑤2个瓶中放入温度计,并用棉团塞住瓶口,以固定温度计并保证保温瓶通气;
⑥24 h后观察并记录2个保温瓶温度数据。
分析讨论:
(1)A瓶的溶液煮沸的目的是 ,(2分)该实验属于 实验。
(2)该实验的自变量是 ,因变量是 。
(3)A、B两瓶的实验结果不同说明 (2分)
49.(8分)如图表示某种植物的非绿色器官在不同的氧浓度下O2吸收量和CO2生成量的变化,请据图回答:
(1)图中曲线QR区段CO2生成量急剧减少的主要原因是
。
(2) 点的生物学含义是无氧呼吸消失点,由纵轴、CO2生成量和O2吸收量共同围成的面积所代表的生物学含义是 。(2分)
(3)若图中的AB段与BC段的距离等长,此时有氧呼吸消耗的葡萄糖量是无氧呼吸的 倍。(2分)
(4)在长途运输新鲜蔬菜时,常常向塑料袋中充入氮气,目的是
。你认为氧浓度应调节到 点的对应浓度,更有利于蔬菜的运输。
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