The scientists ______ the mystery of the double helix, the scope for genetic engineering dramatically increased.
A．having solved
B．after being solved
C．solving
D．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】______

未分类题【T3】A.BELIEF B. ENTRIES C. INTO A. BE CLASSIFIED【T1】______ FOUR TYPES B.【T2】______ FORM. OF WEB LOG C.【T3】______ ON A BLOG ARE ORGANIZED THE WORD 'BLOG' IS A【T4】______ THERE ARE A GREAT NUMBER OF BLOGS ON THE INTERNET TODAY. NOT ONLY CAN THEY PROVIDE INFORMATION TO PEOPLE BUT ENABLE PEOPLE TO WRITE AND REACT ALL KINDS OF IDEAS TO THEM.【T5】______ IN A TIME ORDER WITH THE LATEST ONE AT THE HEAD OF THE RANK. BLOGGERS ARE PEOPLE WHO WRITE ON BLOGS. THEY CAN MAINLY【T6】_________: PERSONAL BLOGGERS, BUSINESS BLOGGERS, ORGANIZATIONAL BLOGGERS AND PROFESSIONAL BLOGGERS.

未分类题According to the blog, Heidi Montag______.A．was ugly before she received reconstructive surgeriesB．is suffering from a serious identity crisis nowC．has changed drastically after the reconstructive surgeriesD．was reluctant to show her gready-changed beauty in public

未分类题Among all the comments, which seems in disagreement with the main idea of the blog?A．Comment 1B．Comment 2C．Comment 3D．Comment 4

未分类题【T1】A. OUT OF B. RURAL C. TO PROTECT A. WORKING【T1】______ THEIR URBAN FOREST B. TREES TAKE POLLUTION【T2】______ THE AIR C. BUT YOU ARE NOT IN【T3】______ AREA YOU ARE STANDING IN A BEAUTIFUL FOREST IN JAPAN. THE AIR IS CLEAN AND SMELLS LIKE PLANTS AND FLOWERS. THERE ARE 175 DIFFERENT KINDS OF TREES, AND 60 KINDS OF BIRDS LIVE HERE.【T4】______ YOU ARE DOWNTOWN IN THE CITY OF NARA, JAPAN, IN KASUGAYAMA FOREST, THE OLDEST URBAN FOREST IN THE WORLD. CITIES AROUND THE WORLD ARE【T5】______ SOME URBAN FORESTS ARE PARKS, AND SOME ARE JUST STREETS WITH A LOT OF TREES. BUT ALL URBAN FORESTS HAVE MANY GOOD EFFECTS ON THE ENVIRONMENT.【T6】______ THEY ALSO STOP THE NOISE FROM HEAVY TRAFFIC.

未分类题Many of the conditions that______population pressures—overcrowding, unemployment, poverty, hunger and illness—lead to dissatisfaction.A．bring forwardB．give rise toC．feed up withD．result from

未分类题Chinese historians have tried to______a balance between individuals and social groups, and between the data of history and their significance.A．produceB．upsetC．strikeD．tip

未分类题In Kansas, Missouri, a computer helps fire-fighters. The computer contains【C1】______about every one of the 350 000 street addresses in the city. When a fire-fighter answers a call, the computer gives him important information about the【C2】______building. The computer can give the【C3】______of the building and its size, type and content. In fact, the computer system has almost unlimited ways of helping fire-fighters with their problems. For example, it can give【C4】______information about invalids living in a burning building. With this information the firefighters can take special care to find these sick persons and remove them quickly and【C5】______. The Kansas City Computer System also contains a medical【C6】______of each of the citys 900 firefighters. This kind of information is【C7】______useful when a firefighter is injured. With this medical information doctors of a hospital can treat the injured fire-fighter more quickly and easily. The fire-fighters themselves greatly【C8】______the computer help. They know about possible dangers ahead【C9】______them and can prepare for them. Many times the computer information helps to save life and property, sometimes the lives are【C10】______of the fire-fighters themselves.【C1】A．materialB．situationC．contentD．information