单项选择题

A．Supply their own light.
B．Locate food and enemies.
C．Compensate for the lack of light.
D．Both B and C.
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单项选择题
A．She’’d like to take her book back.B．She’’d like to borrow a book.C．She’’d like to know whether she could order a book that has come in.D．She’’d like to know whether a book that she’’d ordered has come in.
A．She’’d like to take her book back.
B．She’’d like to borrow a book.
C．She’’d like to know whether she could order a book that has come in.
D．She’’d like to know whether a book that she’’d ordered has come in.
单项选择题
A．Wearing down the soil.B．Building up land.C．Enriching the soil.D．Loosening more earth.
A．Wearing down the soil.
B．Building up land.
C．Enriching the soil.
D．Loosening more earth.
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