单项选择题

It can be concluded that many of London's dockyards are ______.

A．not used
B．fully used
C．seriously blocked
D．opened again
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单项选择题
A tunnel would be ______.
A．less expensive to be built than a bridge
B．more expensive to be built than a bridge
C．less expensive to be built than a rail
D．more expensive to be built than a rail
单项选择题
According to the passage, which of the following factors might spoil the tourists'fun at Mediterranean resorts and beaches
A．Polluted water
B．Crowded buses
C．Traffic jams
D．Rainy weather.
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