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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热门试题

单项选择题Which unit belongs to the Customary System

A．meter
B．kilogram
C．second
D．foot

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