Question

19．Carbon monoxide（一氧化碳） poisoning kills and injures many people and animals around the world．The gas has been a problem since people first began burning fuels to cook food or to create heat．It is a problem in all parts of the world that experience cold weather．
Carbon monoxide is called the silent killer because people do not know it is in the air．The gas has no color．It has no taste．It has no smell．It does not cause burning eyes．And it does not cause people to cough．But it is very deadly．It robs the body of its ability to use oxygen．
Carbon monoxide decreases the ability of the blood to carry oxygen to body tissues．It does this by linking with the blood．When the gas links with the blood，the blood is no longer able to carry oxygen to the tissues that need it．
Damage to the body can begin very guickly from large amounts of carbon monoxide．How quickly this happens depends on the length of time a perosn is breathing the gas and the amount of the gas he or she breathes in．
Carbon monoxide poisoning has waming sings．But people have to be awake to recognize them．Small amounts of the gas will cause a person's head to hurt．He or she may beginto feel tired．The person may have trouble thinking clearly．Peole develop severe head pains as the amount of gas continues to erter their blood．They will begin to feel very tired and sleepy．They may have terribe stomach pains．
Medical experts say carbon monoxide affects people differently．For example，a small child will experience health problems or die much quicker than an adult will．The general heath of person or his or her age can also be important．An older adult with health problems may suffer the effects of carbon monoxide more quickly than a younger person with no health problems．People with heart disease may suffer chest pains．They may begin to have trouble breathing．
 
31．Why is carbon monoxide called the silent killer？B
A．Because it tastes and smells good．
B．Because it is not easily noticed．
C．Because it kills and injures people．
D．Because it always harms people．
32．How does carbon monoxide harm people？D
A．It makes people's blood unable to move．
B．It decreases the amount of blood in the body．
C．It makes body tissues full of blood．
D．It makes the blood less able to carry oxygen．
33．When people breathe in small amounts of carbon monoxide，they mayA．
A．feel a little dizzy             B．suffer a severe headache
C．go around in the room           D．have a terrible stomachache
34．Which of the following about carbon monoxide poisoning is true？C
A．Adults are affected more seriously than children．
B．Young people are more severely affected than old people．
C．People in poor health may have more severe consequences．
D．People with heart problem only suffer from chest pains．
35．The purpose of the passage is toD．
A．warn people not to burn fuels to keep warm in the winter．
B．list the damages that carbon monoxide brings to people．
C．give advice on how to avoid carbon monoxide poisoning．
D．introduce some knowledge about carbon monoxide poisoning．

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一氧化碳的特性，一氧化碳中毒的原理及中毒后人體的反應(yīng)等，提醒讀者一定要謹防一氧化碳中毒．

解答 31．B．細節(jié)理解題．題干關(guān)鍵詞為"the silent killer"．由文章第二段中的"The gas has no color．It has no taste．It has no smell．It does not cause burning eyes．And it does not cause people to cough．"可以看出，一氧化碳無色、無味、不刺激眼睛、也不會讓人咳嗽，也就是說它不容易被人發(fā)覺．故選B．
32．D．細節(jié)理解題．由第三段第一句"Carbon monoxide decreases the ability of the blood to carry oxygen to body tissues．"可以看出，一氧化碳傷害人體的方式是：降低血液攜帶氧氣的能力；故選D．
33．A．細節(jié)理解題．倒數(shù)第二段向我們描述了人體吸入一氧化碳后的反應(yīng)：吸入少量時，會頭疼，感覺勞累，惡心，房子似乎開始轉(zhuǎn)動，不能清晰地思考．A項所說的"feel a little dizzy"對應(yīng)"The room may appear to be turning around．"；故選A．
34．C．細節(jié)理解題．最后一段講述了不同的人吸入一氧化碳后的不同反應(yīng)，老人及身體健康狀況欠佳的人所受的影響會更大．注意，D項干擾性最大，但是"suffer from chest pains"只是患有心臟方面疾病的人一氧化碳中毒后的癥狀之一，而不是唯一的癥狀，其癥狀還包括"terrible stomach pains"；故選C．
35．D．寫作目的題．從全文內(nèi)容可知，文章向我們介紹了一氧化碳的特性，一氧化碳中毒的原理及中毒后人體的反應(yīng)等，故D項是文章的寫作目的；故選D．

點評 考察學(xué)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．