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
With his brows knitted, the doctor contemplated the difficult operation he had to perform.
A．succeeded in
B．decided against
C．went on with
D．thought deeply about
单项选择题
Initially his book did not receive much attention, but two weeks after the critic's review appeared in the newspapers, it climbed to the best sellers' list.
A．At first
B．First of all
C．At first sight
D．From the first
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