A. experimenting with the use of paper bottles B. giving up the use of glass bottles C. increasing the use of plastic bottles D. re-using their paper containers 参考答案:C 答案解析:细节推理题。文中第三自然段指出“乳产品业已开始回收牛奶瓶再利用；但玻璃瓶和纸盒都受到塑料制品的威胁(threatened by the growing use of plastic)。所以选C)。
第23题: [单项选择]若客户没有龙卡信用卡，如何办理专项消费信贷业务？（） A. 先申请龙卡信用卡，审批通过后，方可办理专项消费信贷业务 B. 同时申请办理龙卡信用卡、专项消费信贷业务 C. 先申请专项消费信贷业务，审批通过后，方可申请龙卡信用卡 D. 可不申请龙卡信用卡，直接办理专项消费信贷业务 参考答案:B
第32题: [单项选择]When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （） A. insufficient lubrication B. improper piston cooling C. blow-by D. overload operation 参考答案:C
