单项选择题

Which fact can prove what Newton proposed was right

A．The departing ships seemed to be smaller and smaller when they sailed away.
B．The greater a concentration of mass is at the poles, the stronger its gravitational pull.
C．The length from Earth's center to sea level at tile equator is longer than that at the poles.
D．The changes in the rising of a few millimeters on Earth's surface detected by modern devices.

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单项选择题

Which of the following statements is true according to the first paragraph

A．A number of photos from space show us that the earth is not round.
B．People think the earth is fiat, since its appearance deceived people.
C．Aristotle denied that the earth is flat, basing on the fact that Columbus sailed the ocean.
D．Tile fact that ships appeared smaller when they sailed away showed the earth is round.

单项选择题

What can we infer from Paragraph 3

A．Owing to many dynamic factors, the earth's shape changes.
B．Owing to the passage of time, the earth's shape changes.
C．Owing to being not a perfect oblate sphere, the earth's shape changes.
D．Owing to ocean tides, the earth's shape changes.