单项选择题

Birds (whose) coloring blends in with the leaves (do not) seen (as easily as) (those) with brighter feathers.

A．whose
B．do not
C．as easily as
D．those
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单项选择题
In (the early) grades, the academic performance of girls (are) equal to (that) of boys in math and (almost) equal to boys in science.
A．the early
B．are
C．that
D．almost
单项选择题
There are a number of (reason) why population (is concentrated) in the regions, but the wide variety and (availability) of animal and vegetable life may be (the most important).
A．reason
B．is concentrated
C．availability
D．the most important
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