单项选择题

As a master's candidate, he was always diligent in his study and research.

A．instructive
B．industrious
C．intelligent
D．intense
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单项选择题
Before treating the injuries, the victim's feet should be elevated, otherwise it might make the abdominal injuries more serious.
A．lifted
B．lowered
C．leveled
D．separated
单项选择题
Chinatown has been the center of San Francisco's Chinese community since the 1850s. Its boundaries have expanded significantly since the 1960s, and the neighborhoods built there are generally wealthy.
A．plentiful
B．attractive
C．friendly
D．rich
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