21. 2014年6月英语六级听力短文解析：本题无法直接得出答案，答案是对文章尾部三句话的概括性总结： So when fly the north, they might lay eggs in Louisiana and die. The eggs of that following generation may be found in Kentucky, the eggs of next generation may be in the Kang Michigan. The last generation of the season about the forth may make the journey back in Mexico and restart the cycle. 对应选项C Each generation in a cycle lays eggs at a different place.

　　22. 2014年6月英语六级听力短文解析：由于本文从头到尾都在介绍的迁徙模式和特点，因此容易得出答案为选项C Migration patterns of monarch butterflies.

　　Passage Three

　　Questions 23 to 25 are based on the passage you habe just heard.

　　23.A)Time has become more limited

　　B)Time has become more precious

　　C)Time is money

　　D)Time is relative

　　ANSWER 答案

　　24.A)Americams now attach more importance to the effective use of time.

　　B)Americans today have more free time than earlier generations

　　C)The number of hours Americans work has increased steadily

　　D)More and more Americans feel pressed for time nowadays

　　ANSWER 答案

　　25.A)Our interpersonal relationships improve

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