单项选择题
The word "girl" originally meant young people; and now it refers to young lady. This is an example of _____.
A.meaning shift
B.loss of meaning
C.widening of meaning
D.narrowing of meaning
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单项选择题
Which of the following words contains one bound morpheme
A.Disappearance.
B.Untouchable.
C.Desirablity.
D.Physician.
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单项选择题
Which of the following statements about human alveolar macrophage is TRUE
A.Airborne dust may trigger suppressor macrophage suicides.
B.Airborne dust may trigger stimulatory macrophage suicides.
C.The ratio of suppressor macrophages to stimulatory ones in people with lung diseases is much higher than that in people with healthy lungs.
D.Only stimulatory macrophages show responses to airborne dust.
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