单项选择题

Some workers in the nuclear power station were exposed to high levels of ______.

A．radiation
B．cancer
C．microwaves
D．high temperature
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单项选择题
This is only a ______ agreement: nothing serious concluded yet by far.
A．tentative
B．local
C．decisive
D．kidding
单项选择题
He stepped gingerly into the ramshackle old house.
A．slowly
B．recklessly
C．cautiously
D．alertly
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