单项选择题

In 1931, Joseph Stalin invited George Washington Carver to superintend cotton plantations in southern Russia and to make a tour of the Soviet Union, but he refused.

A．supervise
B．cultivate
C．upgrade
D．discern
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单项选择题
You can come with me to the museum this afternoon ______ you don't mind walking for half an hour.
A．unless
B．so far as
C．except
D．if
单项选择题
Through most city traffic is regulated by automatic traffic lights, the city's residents are notorious for ignoring them.
A．disgraceful
B．infamous
C．offensive
D．awkward
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