单项选择题

As an assistant in a shop, she tries to be courteous at all times, even when she is very tired.

A．straightforward
B．polite
C．flexible
D．neat
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The people who speak Esperanto(世界语) hope that the language someday will become the international language for trade, science, and diplomacy.
A．common
B．unique
C．official
D．well known
单项选择题
They tried their best to resolve the residual problems.
A．domestic
B．remaining
C．geographical
D．$1aborate
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