第一节  完形填空（共10小题；每小题2分，满分20分）

阅读下面短文，掌握其大意，然后从21—30各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。

The theory of evolution(进化)was made by Charles Darwin. It has had a great  2l  on the world today. It has caused many debates between religious authorities and those from the  22  community. This theory makes people think about their origins. It has changed the way in which they think about themselves in the environment. Charles Darwin collected and provided a lot of information to 23 his theory. His theory and research made him the most popular one in the scientific field of  24.

Charles Darwin was born  in l809. He was the fourth child in his family. Much of Darwin's childhood was spent 25 insects and reading books about 26 history. Charles Darwin was not a 27 student during his years at the medical college. He disliked what he was taught. But he 28   an interest in studying rocks and fossils.

Later, he had a chance to travel as a naturalist. It was this chance that made him begin his work on evolution. After a few years' hard study, he wrote a book called The   29   of Species. In this book, Darwin explained his 30  about " natural selection" and " struggle for existence" .