{01}They were trying to remove harmful ______ from cigarettes. A.content B.substances C.materials D.mixtures 解析:此处意思:物质,物体,B项有此意。 本题选B。 {02}He was lucky enough to be sent abroad to study for a business ________. A.requirement B.qualification C.permission D.demand 解析: 本题选B。
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