单项选择题

In architecture(建筑学) ,a vault(拱顶) is a proof or ceiling in the （） of an arch.

A. form
B. figure
C. shape
D. appearance

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单项选择题
The doctor suggests that a person （） exercises every day if he wishes to be healthy.

A. does
B. did
C. do
D. will do
单项选择题
What's the matter with you, my dear I feel my heart （） fast.

A. jump
B. jumping
C. beat
D. beating
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