The polar lights, one of the most unusual phenomena in nature, is beautiful to be
A.view
B.relate
C.sketch
D.withhold
A.view
B.relate
C.sketch
D.withhold
Some scientists set up domes in the Polar Regions.
A.Y
B.N
C.NG
The Polar Express is a movie about the celebration of Thanksgiving.()
Many scientists hold that global warming can be controlled by.
A.reducing the polar bear population.
B.paying more attention to the earth's rising temperatures
C.reducing carbon dioxide emissions
D.refreezing the polar ice caps
The polar regions are generally covered with ice and snow.
A.areas
B.rocks
C.mountains
D.seas
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