单项选择题

The word "it" in line 2 refers to______ .

A．an iceberg that is towed
B．obtaining fresh water from icebergs
C．the population of arid areas
D．real life
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单项选择题
According to the author, most of the world's fresh water is to be found in______ .
A．oceans
B．rivers
C．glaciers
D．reservoirs
单项选择题
How are icebergs formed
A．They break off from glaciers.
B．Seawater freezes.
C．Rivers freeze.
D．Small pieces of floating ice converge.
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