单项选择题

A．They smile to cover embarrassment.
B．It is an unusual and even suspicious behavior.
C．They smile to show politeness.
D．It is an expression of pleasure.
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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．Information in short-term memory is different from that in long-term memory only in content.B．Long-term memory can be achieved only by training.C．It is easier to test short-term memory than long-term memory.D．Henning gave a test on vocabulary to his subjects.
A．Information in short-term memory is different from that in long-term memory only in content.
B．Long-term memory can be achieved only by training.
C．It is easier to test short-term memory than long-term memory.
D．Henning gave a test on vocabulary to his subjects.
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