4.C。根据第三段所讲的内容，C项显然是错误的。

3.D。第二段开头的“People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways.”这两句是解答本题的关键。

2.D。由“The important thing is what you eat every day.”及第一段的内容可知D是正确答案。而根据第二段可知A、B、C皆为错误的。

1.A。本题属表层理解题。由第一段科学家建议七大类食品可知答案非A莫属。

5.C。短文首句即点明了主旨。

　Passage 27　[答案与解析]这篇短文分为三个落：第一段列举了科学家研究了人们每天要吃的食物；第二段讲述了不同国家的人们饮食习惯和饮食结构等各方面有很大差异。但这些对人来说都没不是很重要的，重要的是每天吃什么。第三段阐述了两个问题：如何解决世界人口的吃饭问题，既要吃饱，又要吃得健康。

4.D。文章结尾的“Soon, perhaps, they may be able to forecast the weather for a week or more ahead.”这句即是答案之所在。

3.D。答案就在“the meteorologists compare them with earlier ones. Perhaps they may find that the clouds have changed during the last few hours. This may mean that the weather on the ground may soon change, too.”中。

2.D。“From the pictures，the scientists can often say how the weather will change.”是该小题答案的出处。

1.A。本题属表层理解题。短文首句即是答案之所在。