单项选择题

Recent research into aging suggests that the body' s defense mechanisms may lose the abili ty to distinguish what is alien.

A．insane
B．infectious
C．foreign
D．poisonous
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单项选择题
In ancient Egyptian paintings, royal figures were differentiated by making them several times larger than others.
A．distinguished
B．estranged
C．deferred
D．enlarged
单项选择题
In the flint decades of the twentieth century, the individual gem could not be seen, but could be worked with fruitfully.
A．blindly
B．completely
C．productively
D．carefully
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