单项选择题

A thorough study of biology requires ______ with the properties of trees and plants, and the habit of birds and beasts.

A．acquisition
B．discrimination
C．curiosity
D．familiarity
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单项选择题
In a time of social reform, people's state of mind tends to keep ______ with the rapid changes of society.
A．step
B．progress
C．pace
D．touch
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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