单项选择题

The main purpose of paragraph 1 is to ()

A. accept a conclusion
B. introduce an argument
C. provide a brief history
D. deny a common belief

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单项选择题

Which of the following statements best captures the main idea of this passage()

A. Although gold is very valuable, it is also very expensive.
B. Gold jewelry is stamped with its karat weight.
C. Gold jewelry is made using alloys.
D. Colored gold is more valuable than white gold.

单项选择题

If you’re forbidden to do something, it means you () do it.

A. haven’t got to
B. needn’t
C. couldn’t
D. may not