如果某商品的需求收入弹性大于1，则该商品属于()。A.高档品 B_爱下问搜题

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问题单项选择题

如果某商品的需求收入弹性大于1，则该商品属于()。

A.高档品

B.必需品

C.低档物

D.生活用品

答案

参考答案：A

解析：

收入弹性的大小，可以作为划分高档品和必需品的标准。凡是收入弹性大于1的商品，都可以称为高档品或奢侈品。小于1的则称为必需品。收入弹性为负的商品称为低档品。参见教材P9。

单项选择题

S₂减弱可见于（）。

A.高血压

B.肺动脉瓣狭窄

C.动脉粥样硬化

D.房间隔缺损

E.肺源性心脏病

改错题

短文改错。以下标有题号的每一行均有一个错误，请找出，并按下列情况改正：
此行多一个词：把多余的词用斜线（﹨）划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号（∧）,在该行右边横线上写出该加词。
此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。

    In the age of three, many children go to nursery school. Two
or three years later, they enter in a primary school. Several years
later they go to a secondary school. In some countries this called a
high school. Children remained at their secondary school until they
are between 16 and 18. Then they may have a chance of continue
their study at a university and college. Universities and colleges
are places that some young people go to continue their education
after leaving high schools. Most university student study one main
subject, though we may also study a number of others. Teaching
is usual by lectures, or by discussions between a lecturer and
a group of students.

1.__________
2.__________
3.__________
4.__________
5.__________
6.__________
7.__________
8.__________
9.__________
10.__________