9.In manufacturing,cheaper materials are constantly being substituted ___________ the better,more expensive kind.
问题描述：
9.In manufacturing,cheaper materials are constantly being substituted ___________ the better,more expensive kind.
A.for B.by C.with D.out
10.A bad cold may _______ to pneumonia.
A.lead B.cause C.result D.give
答
A.for
（be being substituted for取代）
A.lead to导致
（B.cause vt.）（ C.result in）（D.give vt.）