单项选择题

In this passage, good writing is compared to free food because __________.

A．both writers and cooks have to work long hours every day
B．both are essential to life
C．both writers and cooks can earn a good living
D．both are enjoyable

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单项选择题

The purpose of the author in writing this passage is __________.

A．to explain and persuade
B．to comment and criticize
C．to interest and entertain
D．to argue and demonstrate