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．The stem of the nettle.B．Small stinging hairs on the nettle’s stem.C．The sap of the nettle.D．The slender nettle.
A．The stem of the nettle.
B．Small stinging hairs on the nettle’s stem.
C．The sap of the nettle.
D．The slender nettle.
单项选择题
A．In the late rooming.B．Immediately after lunch.C．In the mid-afternoon.D．After the evening meal.
A．In the late rooming.
B．Immediately after lunch.
C．In the mid-afternoon.
D．After the evening meal.
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