单项选择题

A person's calorie requirements vary ______ his life.

A．across
B．throughout
C．over
D．within
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单项选择题
The machine needs a complete ______ since it has been in use for over ten years.
A．amending
B．fitting
C．mending
D．renovating
单项选择题
Sometimes the student may be asked to write about his ______ to a certain book or article that has some bearing on the subject being studied.
A．comment
B．reaction
C．impression
D．comprehension
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