单项选择题

The Anglo-Saxons began to settle in Britain in ______ century.

A．the 4th
B．the 5th
C．the 6th
D．the 7th
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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
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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