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【简答题】
____是调节呼吸最重要的化学因素,动脉血中一定浓度的____是维持正常呼吸活动的重要条件。
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A.
B.
C.
D.
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Its seaport
B.
Its university
C.
Its churches and museums
D.
Its parks and gardens
【单选题】【C11】
A.
its discoverer
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its founder
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A.
FROM
B.
TO
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RS
D.
PI D
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A.
at its face
B.
on its face
C.
from its face
D.
in its face
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【简答题】A.Its eyes. B.Its face. C.Its wings. D.Its tail.