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．In the northwest.B．In the southwest.C．In the northeast.D．In the southeast.
A．In the northwest.
B．In the southwest.
C．In the northeast.
D．In the southeast.
填空题
executive
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