C．was good for people to predict future

　　D．was bad for them to live happily

　　解析：细节理解题。根据第二段Too much worry is generally seen as a negative characteristic and high intelligence as a positive one可知，人们以往对焦虑的看法不好。

　　答案：D

　　6．What does the underlined phrase“take no chances”in Paragraph 2 most probably mean?

　　A．Lose scores in competition.

　　B．Choose to help somebody in positive ways.

　　C．Be cautious not to risk doing something.

　　D．Be anxious for another chance to take.

　　解析：词义猜测题。根据上文提到avoid dangerous situations及下文have higher survival rates可推知，焦虑使得人们谨慎行事，这些人会有更高的生存率。由此可推知，画线词组的含义为“不冒险”。

　　答案：C

　　8．What can we learn from the passage?

　　A．The research was based on the metabolism of choline.

　　B．A normal person with high IQ often thinks too little.

　　C．The testees were more than 50 people in the experiment.

　　D．The intelligence is determined by the production of the choline.

　　解析：推理判断题。根据第一段．..high intelligence and worry are both connected with brain activity，which is measured by the reduction of choline in the subcortical white matter of the brain可知，高智商和焦虑都与大脑活动有关，这是通过大脑皮层下的白色物种的胆碱的减少来衡量的。再根据第三段．..judge the relationship between intelligence quotient(IQ)，worry and metabolism of choline in the subcortical white matter可推知，这个研究是基于胆碱的新陈代谢进行的。

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