第30题: [单项选择]A pervasive negative attitude of the engineers toward projects funded by his company is the cause of the delay of signing the contract. A. perpetual B. pernicious C. preventive D. prevalent 参考答案:D 答案解析:pervasive遍布的,蔓延的。prevalent普遍的,意思与之符合。perpetual永久的。 pernicious有害的。preventive预防的。