单项选择题

During the Ice Ages, man developed the use of tools, and this is a way of protecting himself against（）

A. conflicts
B. hazards
C. faults
D. shortcomings

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I don't mind washing up but I hate to（）the beds for the guests.

A. put
B. make
C. arrange
D. wash
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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