单项选择题

A．Because the hot air has to reach a certain temperature.
B．Because the house is very big.
C．Because termites try to escape by hiding in wooden beams.
D．Because termites may survive for a full six hours.
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单项选择题
A．The sea travel in Britain has become more important.B．The sea travel in Britain has become less important.C．The most preferable form of transport in Britain is the sea travel.D．In Britain, the least preferable form of transport is the sea travel.
A．The sea travel in Britain has become more important.
B．The sea travel in Britain has become less important.
C．The most preferable form of transport in Britain is the sea travel.
D．In Britain, the least preferable form of transport is the sea travel.
单项选择题
A．Counting sheep.B．Taking :sleeping pills.C．Drinking coffee.D．Drinking milk.
A．Counting sheep.
B．Taking :sleeping pills.
C．Drinking coffee.
D．Drinking milk.
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