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【单选题】
在正常情况下,呼吸中枢发出呼吸冲动,依赖于血液中哪一种浓度变化的刺激A.
二氧化碳
B.
一氧化氮
C.
氧
D.
碳酸氢根
E.
酸碱度
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皮皮学刷刷变学霸
举一反三
【单选题】It can be inferred that ______.
A.
the man was put into prison
B.
the man was sued for stealing
C.
the man convinced the policeman of the truth at the airport
D.
the girl was arrested at last
【单选题】On hearing of the case some time later， Conan Doyle was convinced that the man was not guilty， and immediately went to work to ascertain the truth.
A.
explore
B.
obtain
C.
verify
D.
search
【单选题】The young man was under the ______ that he was Napoleon.
A.
fantasy
B.
imagination
C.
fallacy
D.
delusion
【单选题】The rain was so heavy that the man was wet to the skin his whole body was______ and trembling.
A.
stiff
B.
straight
C.
steady
D.
hard
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