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【单选题】
呼吸衰竭是指A.
由内呼吸功能障碍引起的病理过程
B.
由外呼吸功能严重障碍引起的病理过程
C.
PaO2<60mmHg的病理过程
D.
有呼吸困难的病理过程
E.
严重肺部疾病引起的病理过程
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举一反三
【单选题】It was a great day, ______ we did not enjoy it at the beginning.
A.
and
B.
but
C.
or
D.
then
【单选题】At the beginning of the century, medical scientists made a surprising discovery: that we are (1)_____ not just of flesh and blood but also of time. They were able to (2)_____ that we all have an inter...
A.
built
B.
shaped
C.
molded
D.
grown
【单选题】Most of what we know about the beginning of languages we learn ______ .
A.
from religious or folk stories
B.
from the Greek historian Herodotus
C.
by reference to their origin
D.
by studying the Phrygian
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