单项选择题

A．Too much algae.
B．Excessive recreational use.
C．Lack of adequate rainfall.
D．Too much evaporation.
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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.
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.
单项选择题
A．England.B．Africa.C．India.D．Asia.
A．England.
B．Africa.
C．India.
D．Asia.
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