第19题: [单项选择]The writer’s main purpose in writing the passage is to say that _________. A. science is just at its beginning B. science has greatly improved man’s life C. science has made profound progress D. science has done too little to human beings 参考答案:A 答案解析:总结归纳题 通过理解全文归纳出答案。文章的最后一段明确指出,It is not just that there is more to do,there is everything to do.从而清