单项选择题

To give you a general idea of our products, we enclose the catalogues showing various products handled by us with detailed______ and means of packing.

A．specimens
B．inspections
C．paraphrases
D．specifications
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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
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
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