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Ⅰ. Read and remember the key words and expressions in Unit 3.
concern, result, increase, destroy, surface, habit, recycle, purpose, solution, government, ...
concern, result, increase, destroy, surface, habit, recycle, purpose, solution, government, ...
答案
此题为词汇记忆题，无需解题步骤，直接呈现答案（按题目要求列出词汇即可）：
concern, result, increase, destroy, surface, habit, recycle, purpose, solution, government
concern, result, increase, destroy, surface, habit, recycle, purpose, solution, government
Ⅱ. Write the words in the right forms according to the explanations.
1. s the top part of an area of land
2. n everything in the world that is not controlled by humans
3. r a thing that is caused by something else
4. l not living
5. g harming the environment as little as possible
6. f not harmful
7. i become bigger, higher or better
8. d damage badly
9. p aim, goal
10. s way of solving the problem
1. s the top part of an area of land
2. n everything in the world that is not controlled by humans
3. r a thing that is caused by something else
4. l not living
5. g harming the environment as little as possible
6. f not harmful
7. i become bigger, higher or better
8. d damage badly
9. p aim, goal
10. s way of solving the problem
答案
1. summit 2. nature 3. result 4. lifeless 5. green 6. friendly 7. increase 8. destroy 9. purpose 10. solution
解析
1. 根据"the top part of an area of land"（一片土地的顶部），以s开头的单词是summit（山顶）。
2. 根据"everything in the world that is not controlled by humans"（世界上不受人类控制的一切），以n开头的单词是nature（自然）。
3. 根据"a thing that is caused by something else"（由其他事物引起的事物），以r开头的单词是result（结果）。
4. 根据"not living"（非活的），以l开头的单词是lifeless（无生命的）。
5. 根据"harming the environment as little as possible"（尽可能少地危害环境），以g开头的单词是green（环保的）。
6. 根据"not harmful"（无害的），以f开头的单词是friendly（友好的，此处指无害的）。
7. 根据"become bigger, higher or better"（变得更大、更高或更好），以i开头的单词是increase（增加，提高）。
8. 根据"damage badly"（严重损坏），以d开头的单词是destroy（破坏）。
9. 根据"aim, goal"（目标），以p开头的单词是purpose（目的）。
10. 根据"way of solving the problem"（解决问题的方法），以s开头的单词是solution（解决方案）。
2. 根据"everything in the world that is not controlled by humans"（世界上不受人类控制的一切），以n开头的单词是nature（自然）。
3. 根据"a thing that is caused by something else"（由其他事物引起的事物），以r开头的单词是result（结果）。
4. 根据"not living"（非活的），以l开头的单词是lifeless（无生命的）。
5. 根据"harming the environment as little as possible"（尽可能少地危害环境），以g开头的单词是green（环保的）。
6. 根据"not harmful"（无害的），以f开头的单词是friendly（友好的，此处指无害的）。
7. 根据"become bigger, higher or better"（变得更大、更高或更好），以i开头的单词是increase（增加，提高）。
8. 根据"damage badly"（严重损坏），以d开头的单词是destroy（破坏）。
9. 根据"aim, goal"（目标），以p开头的单词是purpose（目的）。
10. 根据"way of solving the problem"（解决问题的方法），以s开头的单词是solution（解决方案）。
Ⅲ. Complete the sentences according to the first letter or the Chinese.
1. Coal and oil are two main f , but they are becoming less and less.
2. Jenny came to China for two p . One is for fun and the other is to see her friend.
3. I don’t really know who took away my CD player. I’m just (猜测).
4. We can’t expect Tom to change his terrible (习惯) in a short time.
5. An earthquake happened in Jiuzhaigou on 8 August and it (摧毁) some houses.
1. Coal and oil are two main f , but they are becoming less and less.
2. Jenny came to China for two p . One is for fun and the other is to see her friend.
3. I don’t really know who took away my CD player. I’m just (猜测).
4. We can’t expect Tom to change his terrible (习惯) in a short time.
5. An earthquake happened in Jiuzhaigou on 8 August and it (摧毁) some houses.
答案
1. fuels 2. purposes 3. guessing 4. habit 5. destroyed
解析
1. 根据首字母"f"及"Coal and oil"可知填"fuels"（燃料），two后用复数。
2. 由"One...the other"及首字母"p"可知填"purposes"（目的），two后用复数。
3. "猜测"对应动词"guess"，be动词后用现在分词"guessing"。
4. "习惯"对应名词"habit"，此处用单数形式。
5. "摧毁"对应动词"destroy"，由"happened"可知用过去式"destroyed"。
2. 由"One...the other"及首字母"p"可知填"purposes"（目的），two后用复数。
3. "猜测"对应动词"guess"，be动词后用现在分词"guessing"。
4. "习惯"对应名词"habit"，此处用单数形式。
5. "摧毁"对应动词"destroy"，由"happened"可知用过去式"destroyed"。
