单项选择题

______is known to everybody, the moon travels round the earth once every month.

A．It
B．As
C．That
D．What
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单项选择题
What sort of underground systems are already here with us
A．Offices, shopping areas, power stations.
B．Tunnels, car parks, shopping areas.
C．Gardens, car parks, power stations.
D．Tunnels, gardens, offices.
单项选择题
More and more people in Britain are buying organic food because______.
A．they are getting richer
B．they can get the food anywhere
C．they consider the food free of pollution
D．they like home-grown fruit
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