第20题: [单项选择]The preservation of embryos and juveniles is a ______ occurrence in the fossil re-cord. A. scarce B. lack C. rare D. short 参考答案:C 答案解析:scarce稀少的,不足的,指一般有用而又不足的东西,常用作表语;lack“缺乏的,缺少的,短缺的(of)”;rare“稀少的,稀薄的,极好的,珍奇的”,常用来指罕见而可能是珍贵的东西;short“缺
第31题: [单项选择]His major task is to integrate the work of various bureaus under the ministry. A. organize B. correspond C. coordinate D. respond 参考答案:B 答案解析:[解析] integrate使融合成为整体。organize组织;correspond相符合,相一致;coordinate使协调,使调和;respond回答,回应。故选B项。