单项选择题

I find Peter always______ his classmates in a debate, even though the argument is not sufficient.

A．backs up
B．backs down
C．backs out
D．backs off
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单项选择题
Medical experts believe that the high______ of heart disease and high blood pressure is related to over abundance of cholesterol(胆固醇) in American diet.
A．circulation
B．disturbance
C．incidence
D．suspension
单项选择题
David likes country life and has decided to______ farming though his father suggests him thinking twice before do it.
A．go in for
B．go back on
C．go through with
D．go along with
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