A. act on B. act C. perform D. work 知识第一部分 点: 学生[A;] 标准A; 答答案: 案: 得[5] 试题5.0 分: 分值: 提该题选A ，题目大意是 示: “如果你坚持站在一面，根据它有效地采取行动。” act on： 1. 对...起作用 These medical herbs are said to act on the
heart. 据说这些药草对心脏起作用。 2. 按照...行事 Acting on my recommendation, he has decided to read the novel once more. 按照我的劝告,他决定把这本小说再读一遍。 2. (错误)The _________ of the custom is unknown. A. origin B. source C. place D. sources 知识第二部分 点: 学生[D;] 答案: 标准A; 答案:
得分: [0] 试题5.0 分值: 提该题选A，题目大意是 尚不清楚。” origin：名词 n. 1. 起源；由来；起因 What was the origin of the quarrel? 这场争吵的起因是什么? 2. 出身；门第；血统 His origins were humble. 他出身低微。 示: “这一风俗的起源至今3. I have never been able to track ________ the person who wrote the story. A. out B. up to C. down D. after 知第一部分
识点: 学[C;] 标C; 生准答答案: 案: 得[5] 试5.0 分: 题分值: 提该题选C，题目大意是 示: “写那篇故事的人，我却一直未能找到。” track down：查出，跟踪到 1. They hope to track down the source of the infection. 他们希望查出这种传染病的根源。
2. That no time or money or energy on my part will be soared to track down this scoundrel and hale him before the proper authorities. 我自己决不会吝惜我的时间，我的钱，或是我的力量，一定要把这个流氓追捕归案，拖到官厅来！ 3. Dr Ostrander has already used dogs to track down the genes behind certain cancers that the species shares with people, and to work out the dog family tree. 奥斯特兰德博士已经跟踪了狗类和人类某些共
北邮网络教育大学英语2阶段作业一二三
