单项选择题

The army maintains a constant sea and air______ even there are no war for may years.

A．patrol
B．patron
C．patent
D．pasture
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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
We held different opinions and it needed an outsider to______ our ideas
A．mess... up
B．make... up
C．piece... together
D．knit... together
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