单项选择题

I saw ______ elephant in the street yesterday. It was my first time to see ______ biggest animal on land.

A.an; a
B.a; a
C.an; the
D.a; the
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单项选择题
Why does the author refer to chimpanzees and dog()

A.To suggest that they are much better at interpreting alternations.
B.To reflect how unique jackdaws are in being able to notice gaze orientation
C.To show that they communicate more frequently with humans than jackdaws
D.To make clear that they rely on other means in determining people"s intention.

单项选择题
As the quality of the city s air continues to give rise to ______, the residents are encouraged to set off fewer fireworks.
A.discrimination
B.concerns
C.emergency
D.compromise
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