单项选择题

A．They take in all the light waves.
B．They take in only the black light.
C．They did not take in any light.
D．They reflect all the light waves.
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单项选择题
A．Eight words.B．Ten words.C．Twenty-four words.D．Forty-eight words.
A．Eight words.
B．Ten words.
C．Twenty-four words.
D．Forty-eight words.
单项选择题
A．Too much algae.B．Excessive recreational use.C．Lack of adequate rainfall.D．Too much evaporation.
A．Too much algae.
B．Excessive recreational use.
C．Lack of adequate rainfall.
D．Too much evaporation.
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