第11题: [单项选择]Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ______ of the quality of their products. A. expense B. exposure C. expansion D. expectation 参考答案:A 答案解析:expense意为“花费,消费”;exposure意为“暴露,揭露”;expansion意为“膨胀,扩充”;expectation意为“期待,指望”。at the expense of 是习惯搭配,意
第12题: [多项选择]自然资源种类很多,按能否再生,可分为()。 A. 可更新资源 B. 不可更新资源 C. 非生物资源 D. 用之不尽资源 参考答案:A, B, D