单项选择题

Nationas are classified as "______" when seven percent or more of their people have reached 65.

A．aging
B．being aging
C．aged
D．being aged
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单项选择题
Professor Einstein's book will show you______ can be used in other contexts.
A．that you have observed
B．that how you have observed
C．how that you have observed
D．how what you have observed
单项选择题
The teacher made strenuous efforts to read the faint,______ handwriting in his students' exercise books.
A．illegal
B．illiterate
C．illegible
D．illustrative
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