单项选择题

The aim of using technology to observe the change of Earth is______.

A．to show the change takes place in every minute
B．to figure out the true shape of earth
C．to prove that Earth is not perfectly round
D．to detect the mass distributions inside the planet
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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.
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