有一质量均匀分布的圆形薄板，若将其中央挖掉一个小圆，则薄板的余下部分（ ） A．

关于中毒型菌痢，以下说法错误的是（）

A.中毒型细菌性痢疾多见于2～7岁儿童

B.病原体为志贺菌属，志贺菌侵入小肠上皮细胞生长繁殖

C.细菌裂解后产生大量内毒素与少量外毒素

D.本病多见于平素体格健壮、营养情况较好的小儿

E.混合型病情最为严重

针对给定材料所反映的目前听证会存在的问题，试拟出具体可行的解决措施。 要求：条理清楚，字数不超过300字。

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

对认知结构迁移理论作出重要贡献的心理学家有（　）。

A．奥苏伯尔

B．班杜拉

C．安德森

D．加特纳

E．吉安

广播网出现的意义是（）。

A.扩大了广告效应

B.降低了节目制作成本

C.满足了市场需求

D.以上都对