单项选择题

A．Art history.
B．Elementary education.
C．American literature.
D．Psychology.
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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.
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.
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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