单项选择题

A．It conserves battery power.
B．It lets your laptop rest.
C．It makes your laptop easy to control.
D．It replaces screen saver.
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单项选择题
A．Food is no longer a basic need for us, while it was for primitive people.B．We eat a wide variety of food.C．We no longer eat fruit that primitive people ever ate.D．We eat more food than primitive people do.
A．Food is no longer a basic need for us, while it was for primitive people.
B．We eat a wide variety of food.
C．We no longer eat fruit that primitive people ever ate.
D．We eat more food than primitive people do.
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