单项选择题

According to the author, the importance of greenspaces in the urban environment ______.

A．is still unknown
B．is being closely studied
C．is usually neglected
D．has been fully recognized
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单项选择题
Newton's theory of gravity was corrected by Einstein's theory because of ______.
A．a new hypothesis about gravity
B．careful measurements of Mercury's motion
C．new practical considerations of Newton's theory
D．newly predicted observations
单项选择题
Which statement is true
A．Einstein's general theory of relativity will survive any observations to be found.
B．The general theory of relativity is not an extention of the theory of gravity.
C．The general theory of relativity may be disproved or falsified.
D．The general theory of relativity has completely replaced the theory of gravity.
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