单项选择题

Winter is the toughest season for grasses and flowers to survive in desert.

A． Right
B． Wrong
C． Net mentioned
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单项选择题
The shoot system of perennials can help the plants absorb less of the sun's ray.
A． Right
B． Wrong
C． Not mentioned
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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