单项选择题

As intriguing as these results are, much remains unclear about the impact of low doses of a low doses of alcohol ______ system.

A．immune
B．vulnerable
C．chronic
D．susceptible
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Many feared that the continuing insecurity would ______ the chances of elections being held successfully.
A．aggravate
B．jeopardize
C．manipulate
D．deteriorate
单项选择题
A lateral move that hurt his pride and blocked his professional progress ______ him to abandon his relatively high profile career.
A．persuaded
B．prompted
C．imposed
D．enlightened
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