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單項(xiàng)選擇題

The height of a light is measured from which reference plane?（）

A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level

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The Earth’s irregular heating is caused by （）.

A.the time of day
B.the seasons
C.geography
D.All of the above

單項(xiàng)選擇題

The Earth has the shape of a(n) （）.

A.sphere
B.oblate spheroid
C.spheroid of revolution
D.oblate eggoid