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．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.
单项选择题
A．Because it changes color in a regular 24-hour rhythm.B．Because it changes color in response to the sun’s rays.C．Because it constantly changes color.D．Because it changes color every hour.
A．Because it changes color in a regular 24-hour rhythm.
B．Because it changes color in response to the sun’s rays.
C．Because it constantly changes color.
D．Because it changes color every hour.
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