单项选择题

The investigation group tried in ______to discover what caused the failure of the engine.

A．diligence
B．vain
C．vigor
D．zeal
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单项选择题
The doctor gave the patient a(n) ______ examination to discover the cause of his collapse.
A．thorough
B．universal
C．exact
D．whole
单项选择题
Anthropologists usually study simple, unindustrialized societies because the number of______is limited.
A．vehicles
B．variables
C．varieties
D．systems
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