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单选题
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
A
the equator
B
a great circle
C
a small circle
D
a meridian
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共用题干
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单选题What is the basic principle of the magnetic compass（）.A
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AsB
OnceC
IfD
Although
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a forest looks dark in winter because it absorbs solar energyC
only 0.023 of the energy from the sun is made use of on the earthD
greenhouse gases allow heat energy to escape from the earth’ s surface
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单选题Some radio waves（）the surface of the earth because of its（）.A
are capable of following / distanceB
can follow / altitudeC
can hardly follow / shapeD
are unable following / angle
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