题目内容

The main idea of the first paragraph is that______.

A. the generation gap suddenly appeared
B. the generation gap is a feature of American life
C. how people can reduce the generation gap
D. many critics argue over the nature of the generation gap

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如果两商品是互补商品,那么消费者的无差异曲线的斜率可以是()。

A. 0
B. 1
C. 2
D. 3

有四个商品束,分别为a、b、c、d,如果有a>b,b>c,d>a,按照偏好的传递性假设,下列()选项一定是不正确的。

A. a>a
B. a>c
C. c>d
D. d>b

The main purpose of this passage is to______.

A. discuss traveling in other countries
B. distinguish between passports and visas
C. discuss the financial uses of a passport
D. provide information about passports

British Prime Minister Gordon Brown is a member of the______.

A. Democratic Party
B. Conservative Party
C. Liberal Platy
D. Labour Party

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