单项选择题

Behavior problems of dogs are believed to______.

A．be just part of their nature
B．worsen in modem society
C．occur when they go wild
D．present a threat to the community
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Excuse me. If your call' s not too urgent, do you mind ______ mine first
A．I make
B．if I make
C．me to make
D．that I make
单项选择题
______ the temperature falling so rapidly, we couldn't go on with the experiment.
A．Since
B．For
C．As
D．With
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