试题与答案

人口老龄化按以下的哪项指标来确定() A.老年人人口总数占全体人口总数中百分数 B.

题型:单项选择题

题目:

人口老龄化按以下的哪项指标来确定()

A.老年人人口总数占全体人口总数中百分数

B.老年人的总数

C.预期寿命

D.老年人与非老年人口的比

E.人口的平均年龄

答案:

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参考答案:位于毛根下部,为毛纤维的最下端部分,毛球周围绕着毛 * * 并与之紧密相接,外形膨大成球状,故称之为毛球,促使毛纤维的生长。

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题型:单项选择题

If you often feel tired and the doctor can’t find anything wrong with you, you may be in a state of Subhealth (亚健康). Subhealth is a state between health and illness. Most of the subhealthy people are middle-aged ones who are usually stressed out because of work and family. And some of them are students who are having exams.
If you are subheahlty, it is not difficult for you to become well soon. You should have good living habits. For example, you should get up early and go to bed early. And you should exercise regularly. Exercising can keep you healthy. As for meals, it is better to eat less salt and sugar. Vegetables, fruit and fish are important to your body. You should eat more of them. It is not good to eat too much at one meal, because it may cause unhealthy changes in the digestive tract(消化道). And at last, a balanced diet is very helpful in staying away from subhealth.

What is the main idea of the passage

A.What is subhealth

B.How to keep away from subhealth.

C.How to keep subhealthy.

D.Why are you subhealthy

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