D. fly up and down

　　4. Which is the best title for the passage?

　　A. A Bird’s-Eye View of Teamwork.

　　B. Success Takes Care of Itself.

　　C. The Strongest Will Survive.

　　D. A Science Behind Flying.

　　【参考答案】1—4、DA B A

　　较难题目特训：介绍说明类

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　How is it that siblings (兄弟姐妹) can turn out so differently? One answer is that in fact each sibling grows upin a different family. The firstborn is, for a while, an only child, and therefore has a completely different experience of the parents than those born later. The next child is, for a while, the youngest, until the situation is changed by a new arrival. The mother and father themselves are changing and growing up too. One sibling might live in a stable and close family in the first few years; another might be raised in a family crisis, with a disappointed mother or an angry father.

　　Sibling competition was identified as an important shaping force as early as in 1918. But more recently, researchers have found many ways in which brothers and sisters are a lasting force in each others’lives. Dr. Annette Henderson says firstborn children pick up vocabulary more quickly than their siblings. The reason for this might be that the later children aren’t getting the same one- on- one time with parents. But that doesn’t mean that the younger children have problems with language development. Later- borns don’t enjoy that much talking time with parents, but instead they harvest lessons from bigger brothers and sisters, learning entire phrases and getting an understanding of social concepts such as the difference between “I” and “me”.

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