单项选择题

Only one－fifth of the Americans meet the guidelines for both aerobic and resistance （）.

A.exercise
B.exercises
C.exercising
D.to exercise

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Under the direstion of the surgeon，the instrumentation can be （）.

A.controlling
B.controls
C.controlled
D.control
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In may require long period of mechanical ventilation for （）.

A.surviving
B.survival
C.survive
D.survived
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