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 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.
单项选择题
The Australian national day is set on January 2.6 to commemorate ______.
A．the founding of the Commonwealth of Australia
B．the discovery of the great southern "unknown land"
C．the first European settlement of the continent
D．Captain James Cook's first voyage around Australia
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