There has been ____rising demand for grain as ____industrial material in spite of the nation’s good harvests.
A./;an B.a;an C.the;an D.a;/
There has been ____rising demand for grain as ____industrial material in spite of the nation’s good harvests.
A./;an B.a;an C.the;an D.a;/
B
：Demand作为要求和请求时为可数名词；作为需要需求时为不可数名词，在惯用法中既可以说much demand,也可用 great/rising等形容词修饰，此时前面用不定冠词。Material与此类似。