单项选择题

A．To eliminate swimming entirely.
B．To limit boating and fishing.
C．To limit phosphate detergents.
D．To kill all alga
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单项选择题
A．121 dollars.B．374 dollars.C．53 dollars.D．232 dollars.
A．121 dollars.
B．374 dollars.
C．53 dollars.
D．232 dollars.
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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