单项选择题

Export of handicraft products is the mainstay of the county's economy.

A．rich resources
B．primary concern
C．only source
D．main support
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单项选择题
The man had a rather shady occupation and made a lot of money within a short period of time.
A．profitable
B．comfortable
C．honorable
D．dishonest
单项选择题
Her panic was transient, and ceased when she began to speak.
A．beyond description
B．unnoticed
C．passing quickly
D．vague
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