单项选择题

The medical report contains a (an) ____of words which are comparatively seldom used in ordinary conversation.

A．altitude
B．attitude
C．multitude
D．latitude
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单项选择题
“What’s the matter with that picture on the wall”“It needs（）”

A．straightening
B．to be straightening
C．straightened
D．straighten
单项选择题
Gunpowder was discovered in the twelfth century, but____.
A．man did not put it to use in war two hundred years later
B．until two centuries more it was used in war
C．not used in warfare until two hundred years later
D．in warfare did not use it two hundred years afterwards
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