1. Our eating habits have changed, as has our way of life... 我们的饮食习惯变了，生活方式变了……
【问】as在这里是什么意思?它引导的是什么句子？
【答】as在这里表“也;和……一样”；它引导的是个倒装结构的句子，即：as + 助动词 +主语。如：
They consider him as a friend, as do many others. 他们和许多其他人一样，都把他看成朋友。
John was surprised at the news, as was Susan. 这消息使约翰感到惊讶，也使苏珊感到惊讶。
2. We should also eat carbohydrates, the main fuel for our body, which we can get from bread, rice and noodles. 我们还应当吃碳水化合物，它们是我们体内的主要燃料，我们可以从面包、大米和面条里获取。
【问】在eat的后面跟有两个宾语还是一个宾语？
【答】一个宾语，即carbohydrates。the main fuel for our body是前面carbohydrates的同位语，它相当于一个非限制性定语从句（which are the main fuel for our body），用来补充说明前面名词或代词。如：
We have two children, a boy and a girl. 我们有两个孩子，一男一女。
We, the Chinese people, are determined to build
3． Many people today make choices about their eating habits based on what they believe. 今天许多人根据他们所相信的去选择他们的饮食习惯。
【问】句中的based on...是过去分词短语吗？它在句中起什么作用？
【答】based on...是过去分词短语，修饰前面的名词choices; based on what they believe相当于一定语从句which are based on what they believe。如：
Those students born and brought up in mountain villages had never seen a train. 那些生长在山村里的学生从未见过火车。
4. Books, magazines and television shows tell us about foods and pills we should buy to become smarter, healthier and more beautiful. 书籍、杂志和电视节目告诉我们应该买的食物和药丸，以使我们变得更聪明、更健康、更美丽。
【问】请解释一下we should buy to become smarter, healthier and more beautiful这个句子的语法功能？
【答】这是个省略了关系代词which或that的定语从句，省略的原因是关系代词作及物动词buy的宾语。如：
The letter I received from him yesterday is very important. 昨天他来的信很重要。
to become smarter...是动词不定式短语作目的状语。如：
I stayed there to see what would happen. 我留在那里看看会发生什么事。
He will go to the clinic tomorrow to be examined by the doctor. 他明天去诊所让大夫检查。
