单项选择题

There is no ______ between the sample and the final product he received.

A．constraint
B．consequence
C．conquest
D．consistency
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单项选择题
The exhibition ______ such endangered animals as the giant panda and the Siberian tiger and describes the work being done to protect them.
A．demonstrates
B．exploits
C．features
D．detects
单项选择题
The doctor ______ Billy's operation with x-rays and special exercises to make him stronger.
A．took on
B．followed up
C．started up
D．went after
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