You need to take more exercise if you want to keep healthy .
She ate too much and did not take any exercise .
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 , 《高一英语第十五单元Healthy Eating (健康饮食)(第2页)》出自：www.89xue.com网
www.89xue.com 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
二、学海导航
【学法指要】
单元句型思路明晰
1. Even when + 从句
Even when you are asleep , you are using energy . 甚至在你睡觉时，你也在消耗能量。
〖明晰〗even 作为副词放在由when引起的时间状语从句的前面起加强语气的作用。
Even when it is in August , the weather there is very cold .
Even when he was taking a holiday he was worried about his work .
2 . 主语 + be considered + to be + 主语补足语
The Chinese diet is considered to be the healthiest in the world . 中国饮食被认为是世界上最健康的饮食。
〖明晰〗consider 做“认为”时可以带不定式的复合结构，即：主语 + consider + 宾语 + 不定式（主要是 to be 做宾语补足语）。如果将宾语变为主语，则 consider 用被动语态，原来作宾补的不定式便变成为主语补足语。注意：to be 常常被省略后成为：consider + 宾语 + 名词（或者形容词）。
He considered the task to be the most difficult one . → The task was considered to be the most difficult one by him .
We all consider his suggestion to be reasonable . → His suggestion is considered to be reasonable .
We consider this (to be) a useful book . → We consider this book useful .
单元难点疑点释疑
1 . When playing football or basketball , you might be using 400 calories an hour . 踢足球或者打篮球时，你每小时可能要消耗 400 卡能量。
〖释疑〗连词 when , while 引起的时间状语从句，如果从句中的主语与主句中的主语是同一人或物时，则可以省略主谓语，变成“When / while + ing”这中结构。
While he was doing the experiment , he noticed something strange . = While doing the experiment , he noticed something strange .
2 . In some parts of Britain , one person in ten , by the age of thirty , has no teeth left . 在英国有些地方，十分之一的人年方三十，牙齿就掉光了。
〖释疑〗 one person in ten 即 one person in ten persons 的省略，其意思为“十个中有一个人”。与 one person in ten 类似的结构有：one person out of ten , one out of ten persons 。但是，ten to one 是“十有八九，很可能”。
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