单项选择题

It is said in some parts of the world, goats, rather than cows, serve as a vital ______ of milk.

A．storage
B．reserve
C．resource
D．source
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单项选择题
Within two days, the army fired more than two hundred rockets and missiles at military ______ in the coastal city.
A．goals
B．aims
C．targets
D．destinations
单项选择题
Being ignorant of the law is not accepted as an ______ for breaking the law.
A．excuse
B．intention
C．option
D．approval
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