单选题：A 100-pound child should carry a backpack of more than 20 p

题目内容：

A 100-pound child should carry a backpack of more than 20 pounds. A．Right
B．Wrong
C．Not mentioned

参考答案：

答案解析：

Backpacks with wide, padded straps and a belt can help to a

Backpacks with wide, padded straps and a belt can help to avoid problems of spr

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