单项选择题

Which title is proper for this passage

A．The Change of Earth's Shape.
B．Why the Earth's Shape Changed.
C．Sound Strange: Earth Is Not Round.
D．New Technology and Earth's Shape.
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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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