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
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
The returns in the short ______ may be small, but over a number of years the investment will be well repaid.
A．interval
B．range
C．span
D．term
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