单项选择题

Medical researches ______ much of the rise in the incidence of lung cancer to the widespread use of cigarettes.

A．subscribe
B．ascribe
C．prescribe
D．acknowledge
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单项选择题
In case of intense fear, our ______ response is very often to cry or scream.
A．simultaneous
B．intuitive
C．systematic
D．homogeneous
单项选择题
He ______ a letter to an Internet service that distributes journalists' questions to more than 750 institutions.
A．assigned
B．detached
C．attached
D．dispatched
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