完形填空（2） 阅读下面短文，掌握其大意，然后从11~20各题所给的A、B、C和D项中，选出最佳选项，并在答题卷上将该项涂黑。
The theory of evolution was made by Charles Darwin. It has had a great      11       on the world today. It has caused many debates between religious authorities and those from the   12      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   13         his theory. His theory and research made him the most popular one in the scientific field of    14         .
Charles Darwin was born in 1809. He was the fourth child in his family. Much of Darwin’s childhood was spent   15     insects and reading books about        16       history. Charles Darwin was not a   17        student during his years at the medical college. He disliked what he was taught. But he   18       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      19       of Species. In this book, Darwin explained his  20       about “natural selection” and “struggle for existence” .
11. A. effort                  B. effect                C. affect                      D. affection
12. A. scientific             B. social                C. abstract                   D. material
13. A. imagine              B. picture              C. prove                      D. discuss
14. A. heredity              B. physics              C. chemistry         D. evolution
15. A. raising         B. collecting          C. planting                   D. watching
16. A. natural         B. human              C. literature          D. universal
17. A. naughty              B. popular             C. incommunicative      D. good-tempered
18. A. found          B. realized             C. developed         D. announced
19. A. Origin         B. Beginning  C. End                        D. Result 
20. A. ways                  B. ideas                 C. opinions                  D. theory