单项选择题

The Solo Trek is able to lift off the ground by using （）.

A．a solar powered engine
B．engine-powered twin fans
C．large flapping wings
D．rotating blades

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单项选择题
What the writer worries about in a big city is（）

A．the number of traffic lights
B．the shortage of buses
C．the lack of motorways
D．the traffic congestion
填空题
A．either B．Thursday C．furthest D．clothes
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