C. A travel diary. D. A commercial ad.

　　【解析】　推理判断题。本文作者以第一人称叙述了自己观看蝴蝶迁徙的起因、经过和结果，是一篇旅行日志。

　　【答案】　C

　　Ⅱ.阅读七选五

　　There have always been a lot of commonly believed but false ideas about being fat and doing exercise. 1 However，others hold that if they stop exercising，their muscles will turn into fat.Here are some more examples：

　　I'll never lose weight-I come from a fat family.

　　Wrong! While we can't change the body type we are born with，we can't blame our genes for making us fat. 2 And the main reason is that they share the same habits of eating too much and exercising too little.

　　I am fat because I burn calories(卡路里)slowly.

　　Wrong! Fatness is not caused by a slow metabolism(新陈代谢)．If fact，although fat people consume more energy than slim people，they fail to realize how much they eat！ 3

　　Exercise is boring.

　　Wrong！ 4 The key is to develop a balanced and varied program that's fun as well as progressive.If you enjoy a Sunday walk，take a different route.If you do Yoga，try a T'ai Chi class.

　　 5

　　Wrong! Exercise is not meant to hurt.Indeed，pain is your body telling you something's wrong，and continuing to exercise could lead to serious injury.You may experience mild discomfort as you begin to exercise regularly，but this is your body adapting to the positive changes in your lifestyle and the aches should disappear relatively quickly.If they don't，rest and seek medical advice.

　　A．An apple a day keeps the doctor away.

　　B．Keeping a diary can help you work out your daily food intake more accurately.

　　C．A diary of exercise can prevent people from becoming fat.

D．Some people believe that they can't help putting on weight as they get older.