单项选择题

Over a third of the population was estimated to have no ______ to the health service.

A．assistant
B．assignment
C．exception
D．access
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单项选择题
However, at times this balance in nature is ______ , resulting in a number of possibly un foreseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
单项选择题
Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.
A．by that
B．at that
C．on that
D．in that
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