A．they have used up their energy

　　B．they have lost their living hopes

　　C．they have more pressure in life and work

　　D．they begin to get older

　　答案　C

　　解析　推理判断题。从第四段中的“The percentage is even higher among people who work in management positions as well as students around exam­week.”可看出，中年人容易亚健康是因为他们在生活和工作中的压力更大。故选C。

　　7．As for food，experts suggested that ________.

　　A．we should never eat meat

　　B．we should have a variety of foods

　　C．we should eat less than usual

　　D．we should have meals without salt or sugar

　　答案　B

　　解析　细节理解题。从第七段中的“...eat less salt and sugar...also eat more fresh vegetables，fruits and fish...”可看出，要吃各种各样的食物。故选B。

　　8．The underlined word “alternate” in Paragraph 6 is closest in meaning to ________.

　　A．arrange by turns

　　B．cause to take place

　　C．keep up

　　D．take up

　　答案　A

　　解析　词义猜测题。从本词后面的“work and rest”可推出，这里是指工作和休息要交替进行，即劳逸结合，这样对身体有好处。故选A。

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