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
However, at times this balance in nature is ______, resulting in a number of possibly unforeseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
单项选择题
The patient's health failed to such an extent that he was put into care.
A．tense
B．rigid
C．intensive
D．tight
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