单项选择题

The author' s tone is ______.

A．objective
B．sarcastic
C．negative
D．skeptical
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单项选择题
As used in the 3ut paragraph of this passage, the word documnted means ______.
A．numbered
B．recorded
C．legal
D．believable
单项选择题
The purpose of this passage is to discuss ______.
A．the beneficial use of microwaves
B．the harmful effects of microwaves
C．the modern methods of cooking
D．the use and possible harmful effects of microwaves
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