A.handB.handC.handD.haveThe essay requires perfectingA.……

未分类题Expected noise are usually more______than unexpected ones of the like magnitude.A．manageableB．controllableC．tolerableD．perceivable

未分类题Millions of farmers, drawn by the______of employment, came into the city which made the problems of transportation and housing even more serious.A．prosperityB．prospectC．expectationD．anticipation

单项选择题（）you have worked out the hard problem, you shall have a rest first.

A.By now
B.Ever since
C.Now that
D.In that

未分类题I would have come to see you had it been possible, but I______so busy at that time.A．had beenB．wereC．wasD．would be

未分类题A couple needing a yard for their children rented the house______in the weekend newspaper.A．being advertisedB．advertisingC．advertisedD．to advertise

未分类题There are two spare rooms in the building, neither of______has been provided with modern facilities.A．whichB．thatC．themD．whom

未分类题The scientists ______ the mystery of the double helix, the scope for genetic engineering dramatically increased.A．having solvedB．after being solvedC．solvingD．solved

未分类题Our difference, ______, is one of method, not one of principle.A．which I seeB．as I see itC．that I seeD．I see

未分类题The students were so fascinated by the______Yangtze River that they spent hours sitting on its bank and gazing at the passing boats and rafts.A．medianB．mightyC．measurableD．maximal

未分类题Many of our men are off work with colds just now. We have been______with a skeleton staff.A．getting onB．coming onC．carrying onD．keeping on

未分类题I really dont know how to______ the problem.A．copeB．dealC．tackleD．dispose

未分类题Those of us who smoke should have______ lungs X-rayed regularly since we are all aware of the danger of smoking.A．hisB．ourC．theirD．her

未分类题Despite the development of a vaccine(疫苗), measles(麻疹)______ still a serious danger to adult victims.A．isB．areC．wasD．were

未分类题【T10】A. MEDICAL B. SO C. CONSIDERED A. SEVERAL HOT DAYS ARE【T7】______ A HEAT WAVE B.【T8】______ DOES EXTREME HEAT C. CAUSE SERIOUS【T9】______ PROBLEMS EXTREMELY HOT WEATHER IS COMMON IN MANY PARTS OF THE WORLD. ALTHOUGH HOT WEATHER JUST MAKES MOST PEOPLE FEEL HOT, IT CAN【T10】______ — EVEN DEATH. FLOODS, STORMS, VOLCANO ERUPTIONS AND OTHER NATURAL DISASTERS KILL THOUSANDS OF PEOPLE EVERY YEAR.【T11】______ EXPERTS SAY HEAT MAY BE NATURE'S DEADLIEST KILLER. RECENTLY, EXTREME HEAT WAS BLAMED FOR KILLING MORE THAN ONE HUNDRED PEOPLE IN INDIA. IT IS REPORTED THAT THE TOTAL HEAT OF A HOT DAY OR SEVERAL DAYS CAN AFFECT HEALTH.【T12】______ EXPERTS SAY HEAT WAVES OFTEN BECOME DANGEROUS WHEN THE NIGHTTIME TEMPERATURE DOES NOT DROP MUCH FROM THE HIGHEST DAYTIME TEMPERATURE. THIS CAUSES GREAT STRESS ON THE HUMAN BODY.

未分类题【T19】A. ALL AF THAT B. AS IF IT WERE C. FRESH WATER SUPPLY D. IN THIS FIELD A. A LIMITED【T13】______ B. SO THAT IT CAN BE USED AGAIN JUST【T14】______ FROM A SPRING C. AND WE CANNOT EVEN USE【T15】______ D. EXPERIMENTS HAVE ALREADY BEEN DONE【T16】______ THE WORLD IS NOT ONLY HUNGRY, IT IS ALSO THIRSTY FOR WATER. IT SEEMS THERE IS PLENTY OF WATER, BUT ABOUT 97% OF THIS HUGE AMOUNT IS SEA-WATER, OR SALT WATER. MAN CAN ONLY DRINK AND USE THE OTHER 3% FRESH WATER.【T17】______ , BECAUSE SOME OF IT IS IN THE FORM. OF ICEBERGS AND GLACIERS. EVEN WORSE, SOME OF IT HAS BEEN POLLUTED. AT THE MOMENT, HIS SMALL AMOUNT OF FRESH WATER IS STILL ENOUGH FOR US. HOWEVER, OUR NEED FOR WATER IS INCREASING RAPIDLY. ONLY IF WE TAKE STEPS TO DEAL WITH THIS PROBLEM NOW, CAN WE AVOID A SEVERE WORLDWIDE WATER SHORTAGE LATER ON. ONE OF THE USEFUL STEPS WE CAN TAKE IS TO STOP UNLIMITED USE OF WATER.【T18】______ , HOWEVER, WOULD HAVE A BAD EFFECT ON AGRICULTURE AND INDUSTRY. IN ADDITION TO STOPPING WASTING OUR PRECIOUS WATER, ONE MORE USEFUL STEP WE SHOULD TAKE IS TO DEVELOP WAYS OF REUSING IT.【T19】______ , BUT ONLY ON A SMALL SCALE. TODAY, IN MOST LARGE CITIES, WATER IS USED ONLY ONCE AND IT EVENTUALLY RETURNS TO THE SEA OR RUNS INTO UNDERGROUND STORAGE TANKS. BUT IT IS POSSIBLE TO PIPE WATER THAT HAS BEEN USED TO A PURIFYING PLANT. THERE IT CAN BE FILTERED AND TREATED WITH CHEMICALS【T20】______