17. put on weight 增加体重；发胖。lose weight 减少体重。
Too many sweets and not enough exercise will make you put on weight .
To the great joy of her , she has lost much weight .
18. in the form of 以……的形式
He made the suggestion in the form of a question .
All sounds travel in the forms of waves .
Water exists in the form of ice , snow , steam , etc.
19. one person in ten = one-tenth = one person out of ten 十分之一的人
注意区别：ten to one 十有八九，有可能
20. by the age of 在……岁前；不超过……岁。by 在这里相当于 before 。
She had had three children by the age of 35 .
He had been in the army for two years by the age of 18 .
注意：at the age of 在……岁时。试对比：
She married at the age of 30 .
She had been married by the age of 30 .
21. put … in order 把……按照顺序排列好
22 . value for money 合算，花钱值得
23 . scores of 几十的，大量的，许多的（修饰可数名词）
24 . value of money 合算，花钱值得
25 . lose weight 减少体重
26 . die from heart illnesses 死于各类心脏疾病
相关文章 ■ Unit 15 Healthy Eating教学案例 ■ 高二 Unit 17 Life in the future ■ Unit 14 Mainly revision ■ 高三 Unit 19 Lesson 75 ■ 高三 Lesson 74 ■ 高三 Unit 19 New Zealand ■ 高三 Unit 4 Lesson 16 ■ 高三 Unit 4 Lesson 15 ■ 高三 Unit 4 Lesson 14 ■ 高一 Unit 5 Lesson 14 ■ 高一 Unit 3 Lesson 12 ■ 高三 Unit 4 Lesson 13 ■ 高三 Lesson 12 ■ 高三 Unit 3 Lesson 10,11 ■ 高三 Unit 3 Lesson 9
《Unit 15 Healthy Eating教学案例》出自：www.89xue.com网