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．A stormy ocean.B．Calm water.C．Golden sand.D．Little waves.
A．A stormy ocean.
B．Calm water.
C．Golden sand.
D．Little waves.
单项选择题
A．They have difficulty identifying these ceils.B．They aren’t sure how these cells work.C．They’ve learned how to reproduce these cells.D．They’ve found similar cells in other species.
A．They have difficulty identifying these ceils.
B．They aren’t sure how these cells work.
C．They’ve learned how to reproduce these cells.
D．They’ve found similar cells in other species.
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