单项选择题

The theme of the second last paragraph is why the perennials can survive as plants for several years.

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
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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