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单项选择题
A．7:53.B．7:55.C．7:58.D．8:05.
A．7:53.
B．7:55.
C．7:58.
D．8:05.
单项选择题
A．Because it can strengthen their back muscles.B．Because they are not carrying their body weight on their feet.C．Because it increases your strength more quickly.D．Because they could get a little out of breath.
A．Because it can strengthen their back muscles.
B．Because they are not carrying their body weight on their feet.
C．Because it increases your strength more quickly.
D．Because they could get a little out of breath.
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