单选题：A 10-15 minutes' exercise will help you bear a heavier back

题目内容：

A 10-15 minutes' exercise will help you bear a heavier backpack. A．Right
B．Wrong
C．Not mentioned

参考答案：

答案解析：

Roller bags tend to be heavier than ordinary backpack.

Roller bags tend to be heavier than ordinary backpack.A．Right B．Wrong C．Not ment

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