题目内容

You have to follow the guide whose sole interest is to cover all spots according to his strict schedule.

A. obvious
B. simple
C. only
D. assumed

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Sulfur has occasionally been found in the earth in an almost pure state.

A. regularly
B. accidentally
C. sometimes
D. successfully

下列公式错误的是（）。

A. 总供给＝消费十收入
B. 均衡国民收入＝消费+储蓄
C. 总供给＝消费+储蓄
D. 均衡国民收入＝消费十投资

The most pressing problem any economic system faces is how to use its scarce resources.

A. puzzling
B. difficult
C. terrifying
D. urgent

Sally likes to tease her brother about his girl friends.

A. charm
B. laugh at
C. criticize
D. respect