单项选择题

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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单项选择题
The Earth’s irregular heating is caused by （）.

A.the time of day
B.the seasons
C.geography
D.All of the above
单项选择题
The Earth has the shape of a(n) （）.

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