单选题The proximity of pack ice may be indicated by（）.Achanges in seawater salinityBglare on clouds on the horizonCchanges in air temperatureDicebergs
单选题
The proximity of pack ice may be indicated by（）.
A
changes in seawater salinity
B
glare on clouds on the horizon
C
changes in air temperature
D
icebergs
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