单项选择题

A．Two.
B．Twenty-six.
C．Twenty-eight.
D．Thirty.
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单项选择题
A．Begin breathing through the nostrils.B．Slow down somewhat, but continue straining.C．Stop the particular exercise at once.D．Close his month immediately.
A．Begin breathing through the nostrils.
B．Slow down somewhat, but continue straining.
C．Stop the particular exercise at once.
D．Close his month immediately.
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