单项选择题

First published in 1927, the charts remain an ______ source for researchers.

A．identical
B．indispensable
C．intelligent
D．inevitable
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单项选择题
Joe is not good at sports, but when it ______ mathematics, he is the best in the class.
A．comes to
B．comes up to
C．comes on to
D．comes around to
单项选择题
His business was very successful, but it was at the ______ of his family life.
A．consumption
B．credit
C．exhaustion
D．expense
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