单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Eight words.
B．Ten words.
C．Twenty-four words.
D．Forty-eight words.
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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.
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.
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