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需求大于供给时的价格（）。
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It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).
The vitamins necessary for a healthy body are normally supplied by a ______ of fruit and green vegetables.
The manager ______ all the engagements on the ground that he needed more rest.
She did not throw away the stockings until they were so ______ that they couldn't be mended anymore.
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