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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单项选择题

Microwaves are ______.

A．absolutely safe at low levels
B．very efficient for cooking
C．cancer-causing iii people with weak eyes
D．completely understood by scientists

单项选择题

We can conclude from this passage that ______.

A．the heat created in microwave ovens is very difficult to control
B．food tastes better when cooked in a microwave oven
C．food cooked in microwave ovens is probably more nutritious than food cooked in more conventional ways
D．most research on the effects of microwaves on human beings has been restricted to the study of low level microwave radiation