共用题干 Water Earth is like a big blue marble.From high above the Earth and from the moon,the planet gleams and shines.The blue water in the oceans and seas of the Earth makes a dramatic image.The white clouds above the Earth add beauty to the picture.Water is the source of this beauty and the source of life on Earth.It is the reason people can live on this planet. Water is everywhere.(46)_______.It is in the soil,the ground that grows the food.Water is in rock deep under the ground, in natural holding areas一in storage.In a real sense,water keeps Earth alive. Nature has an unchanging amount of water. Nature has a perfect system for recycling water. (47)_____.It falls as rain.Then it goes to one of three places.It might sink slowly through the soil into the natural holding areas in the rock.(48)_______一by becoming vapor,or gas.It might run off into streams,rivers and oceans.By itself,nature can keep the balance and provide plenty of clean water for us.Nature recycles water. However,people cause problems for this natural recycling system.Nature's recycling system can work well(49)________.Some ways that people upset nature are easy to understand.For example, dirty sewage（污水沟系统）water from homes and factories must not mix with drinking water. People get sick from drinking contaminated water. Sometimes water from factories goes into streams and rivers.It enters into the groundwater. It can flow into lakes too.This kind of contamination from industry(waste water from factories) can be dangerous for people.If water contains poisons and chemicals,it is poison.(50)________;some poisons kill people as well as birds and animals.Without knowing,people can upset nature's recycling system. Lakes and rivers add beauty to the world. People enjoy water for entertainment purposes,too. People enjoy swimming and playing in the cool water of a lake in the summer. They like to ride on boats on rivers.Many people enjoy catching fish in the rivers.They fish for food and for sport.However,in some places,the water of the lakes and rivers is no longer safe.These rivers and lakes are contaminated.The fish are dying because of the chemicals from farms and factories.People cannot swim in the polluted water. _________（46） A:Poison makes people sick B:It is in the air that people breathe C:We can not live without water D:Water is used again and again E:only if people work with the system and not against it F: It might disappear into the air quickly
共用题干 In an age when technology is developing faster than ever before,many people are being ________(51)to the idea of looking back into the past.One way they can do this is by investigating their own family history.They can try to_________(52)out more about where their families came from and what they did.This is now a fast-growing hobby,especially in countries with a ________(53)short history,like Australia and the United States. It is__________(54)thing to spend some time__________(55)through a book on family history and to take the_________(56)to investigate your own family's past.It is__________(57)another to carry out the research work successfully.It is easy to set about it in a disorganized way and __________(58)yourself many problems which could have been_________(59)with a little forward planning. If your own family stories tell you that you are_________(60)with a famous character,whether hero or criminal,do not let this idea take over your research.Just _________(61) it as an interesting possibility. A simple system_________(62)collecting and storing your information will be ad-equate to start with;a more complex one may only get in your_________(63).The most important thing,though,is to___________(64)started.Who knows what you__________(65)find? _________(58) A:produce B:cause C:build D:create
共用题干 Can Loud Music Cause Hearing Impairment（损伤）? Have you ever gone to a concert and realized that your seats were right next to the booming speakers?Are you guilty_________(1)turning up the volume on your portable cassette or CD player to drown out the whining（哭哭啼啼）of your little brother? Sometimes it's difficult to avoid loud music or noises,but they can be bad news because loud noises can_________(2)temporary or permanent hearing loss. Extremely loud music and noises that go on for long periods of_______(3)are common causes of deafness.If a noise is so loud that you have to shout to make yourself _______(4),there is a______(5)that the mechanism inside your ear can be injured. Temporary hearing loss can happen after you've been_______(6)to loud noise for only 15 minutes.If you have temporary hearing loss,you won't be able to hear as ________ (7) as you normally can, and you may have tinnitus（耳鸣）,which is a fancy word for ringing in the ears. Your ears can feel"full",too._________（8), these things usually go away and your hearing soon returns to normal. Permanent hearing loss can happen when someone is exposed to loud noise ________(9)and over. Construction workers and people who work in factories must ________(10)ear protectors because the equipment they use can be extremely loud. But even some lawn mowers（割草机）and power tools can permanently__________ (11)a person's ability to hear high-pitched noises and can also give him permanent tinnitus. Listening to extremely loud music over and over can also have the same effect on a person's ______(12).And using headphones on a portable cassette or CD player can be dangerous________(13)if the volume is too high and the headphones are used a lot, the noise can damage the ears. The best way to avoid hearing loss is to wear ear protectors when working with machinery and earplugs when going to a_________(14).Headphones are OK to wear when you're listening to music;just be sure the volume isn't too high,and give them a rest ________(15)once in a while. _________(10) A:hear B:bear C: wear D: tear
共用题干 Scientists Develop Ways of Detecting Heart Attack German researchers have come up with a new generation of defibrillators（除颤器）and early-warning software aimed at offering heart patients greater________ (51)from sudden death from cardiac arrest（心脏 停搏）. In Germany alone,around 100,000 people die annually________(52)a result of cardiac arrest and many of these cases are caused by disruption to the heart's rhythm.Those most at________(53)are pa- tients who have already suffered a heart attack,and for years the use of defibrillators has proved useful in ________(54)life-threatening disruptions to heart rhythms and correcting them automatically by intervening within seconds.These devices________(55)on a range of functions,such as that of pacemaker（起 搏器）. Heart specialists at Freiburg's University Clinic have now achieved a breakthrough with an implanted defibrillator________(56 ) of generating a six-channel electrocardiogram ( EGG，心电图）within the body. This integrated system allows _________( 57 ) diagnosis of severe blood-flow problems and a pending（即将发 生的）heart attack. It will be implanted in _________( 58 ) for the first time this year. Meanwhile , research- ers at the Fraunhofer Institute for Applied Mathematics in Kaiserslautern have developed new computer soft- ware that________(59)the evaluation of EGG data more precise. The overwhelming majority of patients at risk will not have an implanted defibrillator and must for this ________(60)undergo regular EGGs."Many of the current programs only take into________(61)a line- ar correlation of the data. We are,however,making use in a non-linear process________(62)reveals the chaotic patterns of heart beats as an open and complex system,"Hagen Knaf says,"In this way changes in the heart________(63)over time can be monitored and individual variations in patients taken into ac- count."An old study of EGG data,based upon 600 patients who had________(64)a subsequent heart attack,enabled the researchers to compare risks and to show that the new software evaluates the________ (65)considerably better. _________(64) A:suffered B:launched C:avoided D:started
The lights of the car passing the end of the street showed that . A. a woman was walking by herself up the street B. a man was walking up the street C. a man was driving by himself up the street D. a woman was driving the car
