单项选择题

A．They help people save time on housework.
B．They go into the garbage heap.
C．They are harmful to the environment.
D．They make products more expensive.
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单项选择题
A．To get anything top of the line.B．Bikes that are in good condition.C．To make sure it’s the right height.D．The most important thing is comfort.
A．To get anything top of the line.
B．Bikes that are in good condition.
C．To make sure it’s the right height.
D．The most important thing is comfort.
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