【名词&注释】
同工酶(isozyme)、少数民族(minority)、十字花科(cruciferae)、分子式(molecular formula)、血清学方法(serological method)、电泳分析(electrophoresis)、分类学价值
[单选题]木兰科、蓼科、十字花科和大戟科植物均为单叶。( )
A. 正确
B. 错误
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举一反三：
[单选题]研究蛋白质的分类学价值时采用以下各种研究方法，但除( )以外。
A. 血清学方法
B. 电泳分析(electrophoresis)
C. 同工酶电泳
D. 分子杂交
[单选题]Which of the following is TRUE according to Paragraph 3?
A. Americans do not understand broken English.
B. The author’s mother was not respected sometimes.
C. The author’ mother had positive influence on her.
D. Broken English always reflects imperfect thoughts.
[单选题]18-3．分子式为C5H10O2的酯共有(不考虑立体异构) ：
A. 7种
B. 8种
C. 9种
D. 10种
[单选题]What can we conclude from the text?
A. Most people believe we think in symbols.
B. Loving our own writing is scientifically reasonable.
C. The writers and critics can never reach an agreement.
D. Thinking and writing are different stages of mind at work.
[单选题]In the writer’s opinion, his neighbor was _____________.
A. friendly
B. warm-hearted
C. not considerate
D. not helpful
[单选题]Why was the woman at the airport?
A. She was traveling on business.
B. She was seeing the man off.
C. She was leaving for Greece.
[单选题]What kind of man is doing most housework according to the text?
A. An unmarried man. B． An older married man.
B. A younger married man. D． A married man with children.
[单选题]下列违背价值进规律的是
A. 钻石的稀缺程度比水高，因而钻石比水贵。
B. 古代少数民族用毛皮与汉族交换等价值的大米
C. 甲用一块砖头充当秦代文化，换走乙一块黄金
D. 制造火箭的成本比汽车高，因而火箭比汽车贵
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