单项选择题

A．Because city-dwellers are obliged to adopt a wholly unnatural way of life.
B．Because the sun was hidden from view by tall buildings.
C．Because the noise made by traffic never stops.
D．Because large modem cities are too big to control.
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单项选择题
The example of tadpoles, fish eggs and waterfowl is used to show that the activities of man could give rise to negative chain reactions.
A．Y
B．N
C．NG
单项选择题
A．He already took a picture of the flowers.B．He doesn’’t know how to use the camera.C．He doesn’’t think the flowers are beautiful.D．He does not have any more film left.
A．He already took a picture of the flowers.
B．He doesn’’t know how to use the camera.
C．He doesn’’t think the flowers are beautiful.
D．He does not have any more film left.
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