单项选择题
It's impolite to
cut in
when two persons are holding a conversation.
A．leave
B．talk loudly
C．stand up
D．interrupt
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单项选择题
Grasses and flowers in desert are able to survive because they stay in the
A． Right
B． Wrong
C． Not mentioned
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单项选择题
Desert perennials lose their leaves after the rainy season just as trees lose theirs in wetter climates before winter arrives, but the reasons for this feature are different.
A． Right
B． Wrong
C． Not mentioned
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