单项选择题

Difficult as it is, English study is in the long run ______ to a learner in his or her career development.

A．advantageous
B．rewarding
C．profitable
D．earning
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单项选择题
Stressful environment leads to unhealthy behaviors such as poor eating habits, which ______ increase the risk of high blood pressure and heart disease.
A．in mm
B．by chance
C．by fortune
D．in case
单项选择题
The whole program is well designed, but some details need further ______ by some experts.
A．proofing
B．modifying
C．demonstrating D, polishing
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