单项选择题

The average wavelength of visible light is 2,000 times ______ the diameter of an atom.

A. much as
B. greater than
C. as great
D. more than that
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单项选择题
We have met with so many difficulties. At last, we can see light at the end of the ______.
A. battle
B. tunnel
C. road
D. day
单项选择题
Mac's close ________ to his brother made people mistake them for one another.
A. resemblance
B. identity
C. appearance
D. relationship
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