Question

2．The World Health Organization reports a number of people have died of the Ebola virus in central Africa during the last few months．Ebola，also known as Ebola hemorrhagic （出血） fever or Ebola viral disease．is a rare and deadly illness with high death rates in humans and primates．The natural source of Ebola virus remains unknown，although bats seem to be the most likely source．
The Ebola virus began spreading after victims were discovered in northeastern Cabon．So far，it is the third time Ebola has spread through Cabon since 1994．Health officials believe people moving across the border spread the disease from Cabon co Congo Ebola is highly infectious and kills up to 80% of its victims．Researchers do not know the method with which the virus first appears in humans，but they believe it is through infected animals．The disease then spreads from person to person through blood and other body liquids．
Ebola victims treated early have the base chance of survival．Signs of Ebola include a high temperature，diarrhea，muscle pains and bleeding inside the body．in severe cases，victims experience chest pains and death．There is no known cure for the disease and no way yet to prevent it．
Scientists at the American National institutes of Health are working to develop a vaccine（疫苗） to prevent Ebola．Doctor Cary Nobel is leading the research effort at N-l-H testing center in the eastern state of Maryland．He says that during the past two years，the vaccine has been tested on small animals and monkey a for safety and effectiveness．
In the most recent study，four monkeys who had been given the vaccine were completely protected from a deadly injection of the Ebola virus．the study was described in November in Nature magazine．Doctor Nobel says the tests appear to have moved scientists one step closer to a vaccine for humans．
28．Where does the Ebola virus come fromD？
A．Bats．B．Monkeys．C．Infected humans．D．Something unknown．
29．When infected with Ebola virus，people may experience the following exceptA．
A．heart attack B．a(chǎn) rise in temperature
C．chest pains D bleeding inside the body
30．What can we learn from the passageB？
A．Once infected with the Ebola virus．people can never survive．
B．Half of the Ebola victims will lose their lives．
C．No cure has been found for the disease．
D．Scientists have succeeded in preventing Ebola．
31．What is Doctor Nobel's attitude towards the testsB？
A．Discouraged．B．Positive．C．Doubtful．D．Not mentioned．

Answer 1

分析 本文屬于說明文閱讀，作者通過這篇文章主要向我們描述了埃博拉病毒給人類造成的巨大傷害，它的傳染性很強，主要通過血液和體液傳播，患病者死亡率極高，只有在患病初期有痊愈的機會，世界衛(wèi)生組織已經(jīng)研究了疫苗，目前已在動物身上試驗，有待下一步動作．

解答 28．D．細節(jié)理解題．根據(jù)文章第一段"The natural source of Ebola virus remains unknown，although bats seem to be the most likely source"，埃博拉病毒的天然來源仍然未知，盡管蝙蝠似乎是最有可能的來源；故選D．
29．A．細節(jié)理解題．根據(jù)文章第三段"Signs of Ebola include a high temperature，diarrhea，muscle pains and bleeding inside the body．in severe cases，victims experience chest pains and death"，埃博拉病毒的標志包括高溫、腹瀉、肌肉疼痛和身體內(nèi)出血，嚴重的情況下，受害者經(jīng)歷胸痛和死亡；故選A．
30．B．細節(jié)理解題．根據(jù)文章第三段"Health officials believe people moving across the border spread the disease from Cabon co Congo Ebola is highly infectious and kills up to 80% of its victims"衛(wèi)生官員相信人跨越邊境傳播的埃博拉病毒的傳染性很強，病人死亡率達80%；故選B．
31．B．推理判斷題．根據(jù)文章最后一段"Doctor Nobel says the tests appear to have moved scientists one step closer to a vaccine for humans"，諾貝爾醫(yī)生說，這些測試結(jié)果的出現(xiàn)正推動科學家們一步一步接近人類的疫苗，可推測他的態(tài)度是積極的；故選B．

點評 考察學生的細節(jié)理解和推理判斷能力，做細節(jié)理解題時一定要找到文章中的原句，和題干進行比較，再做出正確的選擇．在做推理判斷題不要以個人的主觀想象代替文章的事實，要根據(jù)文章事實進行合乎邏輯的推理判斷．