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【单选题】
以下属于氯化铵的祛痰机制的是A.
增强呼吸道纤毛运动，促使痰液易于排出
B.
使呼吸道分泌的总痰液量降低
C.
恶心性祛痰作用，反射性引起呼吸道分泌增加，使痰稀释易咳出
D.
粘痰溶解和黏液排除促进作用
E.
能裂解糖蛋白多肽链中的二硫键，使痰黏稠度降低，易于咳出
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反馈参考答案：
举一反三
【单选题】Mr. Brown used to ________ several newspapers before breakfast.
A.
look into
B.
look up
C.
look through
D.
look around
【单选题】— Why Mr. Wang was _____ the general manager of north area? —Because his excellent in sale. [ ]
A.
appointed to be
B.
made as
C.
sent to
D.
chosen to
【单选题】-Why was Mr. Wang ________the general manager of north area? -Because of his excellence in sale. [ ]
A.
appointed to be
B.
made as
C.
sent to
D.
choose to
【单选题】—Look, Mr. King is swimming in the pool. —It ________ be Mr. King. He has gone to Kunming on vacation. [ ]
A.
can
B.
can't
C.
must
D.
mustn't
【单选题】The policeman was there ______.
A.
to look for Mr. Hill's uncle
B.
to see Mr. Hill about some trouble at the hand
C.
to visit Mr. Hill, his uncle
D.
to meet his mother
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