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【判断题】
汽车制动性能的评价指标为：制动效能、制动效能的恒定性2项。()A.
正确
B.
错误
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【单选题】下图表示叶绿体色素吸收光能的情况，根据此图并结合所学知识，以下说法中正确的是 ①叶绿素a对420nm、670nm波长的光的转化率较高 ②在晚间用大约550nm波长的绿光照射行道树，目的是通过植物光合作用以增加夜间空气中的氧气浓度 ③据图可知，用白光中450nm左右波长的光比白光更利于提高光合作用强度 ④在层析液中，类胡萝卜素的溶解度大于叶绿素 ⑤土壤中缺乏镁时，420nm～470nm左右波长的光的...
A.
①④⑤⑥
B.
①③④⑥
C.
②③④⑤
D.
①②④⑤
【简答题】阅读理解。 In Canada and the U.S.A, people enjoy entertaining (请客) at home. They often invite friends over for a meal, a party, or just for coffee and a conversation. Here are the kinds of things people sa...
【简答题】阅读理解。 In the U.S.A. or Canada, on Sundays many people go out for a picnic. They often ask their good friends to go with them. They bring many things with them, like glasses, kites, knives, some nice f...
【简答题】Colours often have different meanings in different cultures. In the U.S., people have found the following to be true. Black Black is the colour of power. It is also popular in fashion because it makes...
【单选题】In the U. S. , black people often score below white people on intelce tests. With this in mind, which one of the following statements is not true?
A.
Nature proponents would say that whites are genetically superior to black.
B.
Nurture proponents would disagree that blacks are biologically inferior to whites.
C.
Supporters of the nature theory would say that whites score well because they have a superior environment.
D.
Behaviorists would say that blacks often lack the educational and environmental advantages that whites enjoy.
【简答题】(2014年新课标II卷) 在下面一段文字横线处补写恰当的语句,使整段文字语意完整连贯,内容贴切,逻辑严密。每处不超过 15 个字。( 5 分) 二氧化碳是最主要的大气保温气体之一。大气中的二氧化碳浓度升高会导致全球变暖,造成天气干旱或旱涝不均,甚至可能造成海洋水位上升,淹没大量沿海城市, 1 。 然而,也有研究指出, 2 :比如增加的二氧化碳可以给植物“施肥”,有利于植物的生长 。但这必须有个前...
【单选题】2015－2016学年高一生物期末考试选择题第33小题答案
A.
33. 下图表示叶绿体色素吸收光能的情况，根据此图并结合所学知识，以下说法中正确的是 A．在晚间用大约550nm波长的绿光照射行道树，目的增加空气中的氧气浓度
B.
据图可知，用白光中450nm左右波长的光比白光更有利于提高光合作用强度
C.
土壤中缺乏镁时，420nm～470nm左右波长的光的利用量显著增加
D.
由550nm波长的光转为6 70nm波长的光后，叶绿体中C3的量减少
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