单项选择题

A．By pausing.
B．By raising pitch.
C．By lowering registers.
D．By pointing to a chart.
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单项选择题
A．That a snow cover can cause ice to melt. B．How heat can prevent ice from melting. C．How water flows into the ocean. D．Why volcanoes have a slippery surface.
A．That a snow cover can cause ice to melt.
B．How heat can prevent ice from melting.
C．How water flows into the ocean.
D．Why volcanoes have a slippery surface.
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