单项选择题

Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which______ affects the circulatory system.

A．in the long run
B．in turn
C．in return
D．as a result
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单项选择题
When we encounter more difficulties, we should be more spirited, and we should be more courageous______.
A．the more danger we are in
B．the more in danger we are
C．we are in more danger
D．we are in danger more
单项选择题
Some people say that if the holder of chopsticks pushes them______ his stomach to even them up instead of tapping them on the table, the chances are he is a coolie.
A．on
B．against
C．at
D．to
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