单项选择题

A．It is more comfortable than a conventional train.
B．It doesn’t require much track maintenance.
C．It doesn’t remain in any station very long.
D．It carries more passengers than a conventional train.
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单项选择题
A．in whichB．from whichC．of whichD．by which
A．in which
B．from which
C．of which
D．by which
单项选择题
A．To learn how to prevent a bone disease.B．To understand differences between bone tissue and other tissue.C．To find out how specialized bone cells have evolved.D．To create artificial bone tissue.
A．To learn how to prevent a bone disease.
B．To understand differences between bone tissue and other tissue.
C．To find out how specialized bone cells have evolved.
D．To create artificial bone tissue.
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