第27题: [单项选择]Diderot was also a philosophical materialist,______ that thought developed from the movements and changes of matter. A. believing B. have been located C. believes D. be locating 参考答案:A 答案解析:这道题测试句子结构知识。believing是现在分词,其余三个选项插入句中都会出现严重的句子结构错误,B和D还会引起句义混乱。
第28题:[单选题]B-A-C-037 4 2 5 酸性气出装置流量增大后又突然下降可能原因是( )。 A. 贫溶剂泵抽空 B. 再生塔再沸器内漏 C. 再生塔液面波动 D. 再生塔冲塔 参考答案:D