【正文】 e of the history of philosophy is important to Marxists， even during the present critical days. 21. What is the main idea of this passage？ [A] The main idea of this passage is the argument whether philosophy will ultimately be solved by science or not. [B] The importance of learning philosophies， especially the history of philosophy. [C] The difference between philosophy and science. [D] A discuss about how to set a proper attitude towards future. 22. The example of what Plato thought in the passage shows that [A] the development of science really can solve a great many of the problems on which philosophers still argue [B] plato knew nothing about Physics [C] the scientists have achieved a lot in terms of light theory [D] different people have different ways of perception 23. What field can our descendants know？ [A] The origin of human beings [B] Some questions that perplex us today. [C] Many philosophical problems which Marx and Engels wrote rather little. [D] The future. 24. How many kinds of ideas are there about the future？ [A] Two [B] Three [C] Four [D] Five 25. What are the functions of studying philosophies mentioned in the passage？ [A] The study of philosophies would make our own idea flexible. [B] The study of philosophies would help prepare us for the future and guide our actions. [C] The study of philosophies would enable us to understand how things develop as to better tackle the future. [D] All of the above. Text 2 This line of inquiry did not begin until earlier this month— more than three months after the accident— because there were “too many emotions ， too many egos， ” said retired Adm. Harold Gehman， chairman of the Columbia Accident Investigation Board. [an error occurred while processing this directive] Testifying before the Senate Commerce Committee， Gehman said this part of his inquiry was in its earliest stages， starting just 10 days ago. But Gehman said he already has concluded it is “inconceivable” that NASA would have been unable or unwilling to attempt a rescue for astronauts in orbit if senior shuttle managers and administrators had known there was fatal damage to Columbia39。s decisions against more aggressively checking possible wing damage in the days before Columbia39。s wing shortly after liftoff， allowing superheated air to perate the wing during its fiery reentry on ， melt it from inside. Among those decisions was the choice by NASA39。s left wing before the accident. The subject dominated the early part of Wednesday39。s inaction during the 16 day shuttle mission. “We will attempt to pin this issue down in our report ， but there were a number of bureaucratic and administrative missed signals here， ” Gehman told senators. “We39。s most sophisticated spy satellites might have detected on Columbia39。 [A] Gehman39。s Safety [D] NASA39。s inaction during its mission. mentioned in the text， the Wednesday39。s indecisions against checking upon the Columbia [C] NASA39。s attitude towards satellite images？ [A] Apprehensive. [B] Credulous. [C] Indifferent. [D] Cautious. Text 3 Gene therapy and gene based drugs are two ways we could benefit from our growing mastery of geic science. But there will be others as well. Here is one of the remarkable therapies on the cutting edge of geic research that could make their way into mainstream medicine in the ing years. While it39。t begun to specialize [an error occurred while processing this directive] Yet this untapped potential could be a terrific boon to medicine. Most diseases involve the death of healthy cells— brain cells in Alzheimer39。t be controlled， and may have unforeseen limitations； but if efforts to understand and master stem cell development prove successful， doctors will have a therapeutic tool of incredible power. The same applies to cloning， which is really just the other side of the coin； true cloning， as first shown with the sheep Dolly two years ago， involves taking a developed cell and reactivating the genome within， resetting its developmental instructions to a pristine state. Once that happens， the rejuvenated cell can develop into a full fledged animal， geically identical to its parent. For agriculture， in which purely physical characteristics like milk production in a cow or low fat in a hog have real market value， biological carbon copies could bee routine within a few years. This past year scientists have done for mice and cows what Ian Wilmut did for Dolly， and other creatures are bound to join the cloned menagerie in the ing year. Human cloning， on the other hand， may be technically feasible but legally and emotionally more difficult. Still， one day it will happen. The ability to reset body cells to a pristine， undeveloped state could give doctors exactly the same advantages they would get from stem cells： the potential to make healthy body tissues of all sorts， and thus to cure disease. That could prove to be a true “miracle cure.” writer holds that the potential to make healthy body tissues will [A] aggravate moral issues of human cloning [B] bring great benefits to human beings [C] help scientists decode body instructions [D] involve employing surgical instruments word “rejuvenated” （ Para. 5） most probably means [A] modified[B] re collected[C] classified[D] reactivated research at the University of Wisconsin is mentioned to show [A] the isolation of stem cells [B] the effects of gene therapies [C] the advantages of human cloning [D] the limitations of tissue replacements of the following is true according to the text？ [A] The principle of gene therapy is applicable to that of cloning. [B] The isolation of stem cells is too difficult to be feasible. [C] It is reaso