【Unit 3 Science and nature】本单元的主题围绕科学与自然展开，主要探讨了科学的快速发展以及与之相关的伦理问题，特别是克隆技术的应用。在学习过程中，学生将接触到关于科学进步的不同观点，以及如何权衡科技进步与道德责任的关系。
一、介、副词填空解析：
1. "Science is developing faster than we can ________ think about it." ——此处应填"even"，表示科学发展的速度甚至超过了我们的想象。
2. "However, ________ general the scientists were praised ________ their wonderful scientific advance." ——此处应填"on, for"，表示科学家们总体上因为他们的科学成就而受到赞扬。
3. "Instead, he thinks research efforts should concentrate ________ creating new tissues and organs that can be used to cure diseases like cancer." ——此处应填"on"，意为研究应该集中在创造新的组织和器官来治疗疾病。
4. "Cloning human embryos ________ the intention of destroying them shows no respect ________ human life." ——此处应填"with, for"，表明出于破坏目的的人类胚胎克隆是对人类生命的不尊重。
5. "Some scientists are already pushing ________ with research in order to produce a cloned human baby." ——此处应填"ahead"，表示一些科学家正在积极推进相关研究。
6. "China has succeeded ________ producing clones of cows and goats, and continues to research ways ________ which cloning can benefit mankind." ——此处应填"in, for"，说明中国成功克隆了牛和羊，并继续寻找克隆技术对人类有益的方法。
7. "If we toy ________ nature, we will have to deal with the consequences." ——此处应填"with"，意味着如果对大自然玩弄，我们必须承担后果。
8. "I would like to comment ________ your article, ‘The perfect copy’." ——此处应填"on"，表示想对你的文章发表评论。
9. "When reading articles about science, we often come ________ difficult scientific terms." ——此处应填"across"，表示在阅读科学文章时常常会遇到难懂的科学术语。
10. "For this reason, I also don’t accept the idea of cloning humans—mankind is not ready ________ this." ——此处应填"for"，表示因此，我不接受克隆人类的想法，人类还没有准备好面对这一问题。
二、佳句翻译与仿写：
1. "On the one hand, some scientists point out that.... On the other hand, many people, including some scientists, disagree and are afraid that..." 翻译：一方面，一些科学家指出...另一方面，许多人，包括一些科学家，持反对意见并担心...
仿写：一方面，天然气造成的污染较少；另一方面，天然气仍比其他能源便宜。
"On the one hand, natural gas causes less pollution; on the other hand, natural gas is still cheaper than other energy resources."
2. "The first mammal to be cloned successfully from an adult cell was Dolly the sheep." 翻译：第一只通过成体细胞成功克隆的哺乳动物是多莉羊。
仿写：那是那年上演的第一场戏。
"It was the first play performed that year."
3. "China has succeeded in producing clones of cows and goats." 翻译：中国已经成功地克隆了奶牛和山羊。
通过以上内容，我们可以了解到科学与自然单元中的核心话题是科学的迅速发展，特别是克隆技术的伦理讨论，同时也涉及到科技成就与自然平衡之间的关系。学生将通过这些作业题来深入理解和反思科学进步的意义与影响。
