单项选择题

A．It defined easy words as well as hard ones.
B．It was nothing more than a list of difficult words.
C．It included a number of everyday words.
D．It was considered to be a very valuable one.
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单项选择题
A．He stayed alone all night.B．He introduced himself to a very charming girl.C．He went home shortly after.D．None of the above.
A．He stayed alone all night.
B．He introduced himself to a very charming girl.
C．He went home shortly after.
D．None of the above.
问答题
S4. What significance do the experiments at the Rocky Mountain Arsenal have
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