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问题 选择题

严冬我国北方某些城市曾用食盐融雪，造成土壤中含盐浓度偏高，使路旁树木死亡。目前专家已研究出一种新型融雪剂，既能融化冰雪，又能起施肥养护树木的作用。具有上述作用的新型融雪剂是 [ ]

A. 氯化钠 氯化钙

B. 氯化钠 氯化镁

C. 氯化钠 醋酸钙

D. 尿素 硝酸钙 硝酸镁

答案

答案：D

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单项选择题

Researchers studying sets of identical twins who were raised apart in dissimilar environments found that in each case the twins were similar in character, medical history, and life experiences. The researchers saw these results as confirmation of the hypothesis that heredity is more important than environment in determining human personalities and life histories.
The existence of which of the following would tend to weaken the support for the hypothesis above most seriously

A．A set of identical twins raised together who are shown by appropriate tests to have very similar value systems.

B．A pair or identical twins raised apart who differ markedly with respect to aggressiveness and other personality traits.

C．A younger brother and older sister raised together who have similar personalities and life experiences.

D．A mother and daughter who have the same profession even though they have very different temperaments.

E．(E) A pair of twins raised together who have similar personality traits but different value systems.
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