第14题: [单项选择]What does the author say about excessive Internet use
A. People should be warned of its harmful consequences. B. It has become virtually inevitable. C. It has been somewhat exaggerated. D. People haven’t yet reached agreement on its definition. 参考答案:D
第15题:[单选题]环境污染对人群健康的影响主要表现为( )。 A. 急慢性中毒、三致作用 B. 慢性毒作用 C. 急性中毒、亚急性中毒、慢性中毒 D. 致癌、致畸、致突变 E. 慢性中毒、致癌作用 参考答案:A