单项选择题

If the test taker finds an item to which an answer is not known, it may be wise to leave it blank and go on with the test.（）

A. valuable
B. advisable
C. considerable
D. probable

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The gar is a fish with a long, slender body and scales as hard as flint.
A．flat
B．straight
C．slim
D．fragile
单项选择题
The cost of elections in the United States is borne by both the government and the private sector.
A．known
B．fought
C．exposed
D．assumed
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