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【单选题】
海洋中某些微生物爆发性增殖时水面会发生变色，这种现象被称为赤潮。这些微生物死后会产生毒素。当海獭的主要食物来源蛤蜊被赤潮毒素污染时，海獭就不会在那些区域觅食，对于海獭的这种行为，一种解释认为，海獭在某个地方正式觅食之前会先尝几个蛤蜊，并且能够觉察出其中的任何毒素。 以下哪项为真，将最有力地表明上述解释是不正确的?（ ）
A.
在赤潮出现的某些海域，既没有蛤蜊也没有海獭
B.
少量的赤潮毒素不会产生什么危害，但是大量的这种毒素会使海獭死亡
C.
当没有受到赤潮影响的一片海水被人为地染成棕红色时，海獭也不吃那些地方的蛤蜊
D.
海獭在某个海域出现是一种显著的标志，表明那里可以找到其他海洋生物
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in the maternal genes
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throughout the protoplasm
D.
in the beaded portions of the DNA strings
E.
in certain sections of the cell nucleus
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【单选题】We can conclude from the passage that ______.
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【单选题】It can be inferred from the passage that the initial production of histones after an egg is fertilized takes place______
A.
in the cytoplasm
B.
in the maternal genes
C.
throughout the protoplasm
D.
in the beaded portions of the DNA strings
E.
in certain sections of the cell nucleus
查看完整题目与答案
【单选题】What's the common opinion of Sue Leslie and Elizabeth Cade?
A.
Cosmetic surgery is necessary for people to look their best.
B.
People should be happy with themselves, regardless of how they look.
C.
People should go to "Sue's Salon" to make them look younger.
D.
It's ridiculous for people to make themselves beautiful in some unhealthy ways.
查看完整题目与答案
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【单选题】Figure 2 The figure below depicts a total cost function for a firm that produces cookies. Refer to Figure 2. Which of the following is true of the production function (not pictured) that underlies thi...
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【判断题】班主任的基本职责是组织和培养良好的班集体,全面负责全班每个学生的发展。
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B.
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B.
He is a driver
C.
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【单选题】The slope of the budget line represents an opportunity cost because, moving along the line,
A.
income is increasing.
B.
income is decreasing.
C.
additional income must be earned in order to purchase more of one good.
D.
a consumer must give up some of one good in order to get more of the other.
E.
it is possible to consume more of both goods.
查看完整题目与答案
【单选题】We can conclude from the passage that ______.
A.
most teachers complained after the initial shock
B.
four percent of the teachers went up to 300 volts
C.
the majority of teachers did not deliver shocks above 150 volts
D.
thirty-eight percent of all the subjects did not deliver shock all the way up to 450 volts.
查看完整题目与答案