大学综合英语Unit 4答案详解.doc

Unit 4 I. Vocabulary Analysis 1. Phrase practice 1. live life up= to have a very enjoyable and exciting time 积极向上地生活 e.g. I was determined to live life up after witnessing the tragedy. 目睹那场悲剧之后，我决定要积极的生活。 2. turn one’s back on = to go away from or refuse to be with 拒绝帮助 e.g. I can’t turn my back on friends who are in need of help. 我不能在朋友需要的时候拒绝他们。 They didn’t see each other since he turned his back on her. 自从他拒绝帮助她，他们就再也不联系了。 3. stick it out =not to give up 坚持到底 e.g. As long as you stick it out, you will have your day. 只要你坚持到底，你总会成功的。 Be brave, and stick it out! 勇敢一点，坚持到底！ 4. go through so much =to experience so much pain and stress 经历辛苦 e.g. Why do you quit now after going through so much? 经历了那么多艰辛，你怎么现在放弃了呢？ 2. Word comparison 1. tighten: if you tighten your grip on something, or if your grip tightens, you hold it more firmly or securely e.g. Stefano’s grip tightened and his tone became colder. strengthen: to make something stronger or more effective, or to become stronger or more effective e.g. They have been strengthening their border defenses in preparation for war. lengthen: to make something longer or to become longer e.g. The days lengthened as summer approached. widen: if you widen something or if it widens, it becomes greater in measurement from one side or edge to the other e.g. The river widens considerably as it begins to turn east. 2. disturbed: not thinking or behaving normally because of mental or emotional problems e.g. This is a center for emotionally disturbed teenagers. bothered: worried or upset e.g. He doesn’t seem too bothered about the things that are written about him in the papers. worried: when you are worried, you are unhappy because you keep thinking about problems that might happen in the future e.g. If you’re at all worried about his progress, do discuss it with one of his teachers. troubling: something that is troubling makes you worried or nervous e.g. Some troubling questions remain about the legal status of huma