单项选择题

A．start
B．leave
C．keep
D．repair
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单项选择题
A．partB．halfC．numberD．side
A．part
B．half
C．number
D．side
单项选择题
How are clouds classified
A．According to their size.
B．According to their shape.
C．According to their colour.
D．According to their height above sea level.
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