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  3. Excerpt 1 The process of vaccination allows the patient’ s body to develop immunity to the virus or disease so that, if it i

Excerpt 1 The process of vaccination allows the patient’ s body to develop immunity to the virus or disease so that, if it i

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问题 Excerpt 1
    The process of vaccination allows the patient’ s body to develop immunity to the virus or disease so that, if it is encountered, one can ward it off naturally. To accomplish this, a small weak or dead strain of the disease is actually injected into the patient in a controlled environment, so that his body’ s immune system can learn to fight the invader properly. Information on how to penetrate the disease’ s defenses is transmitted to all elements of the patient’s immune system in a process that occurs naturally, in which genetic information is passed from cell to cell.
Excerpt 2
    Scientists are hoping to eliminate malaria (疟疾) by developing a genetically modified mosquito that cannot transmit the disease. Malaria has long troubled the populations of South America, Africa, and Asia, where mosquito bites infect to 500 million people a year with this serous and sometimes fatal parasitic blood disease.For generations, scientists have been trying to eliminate malaria by developing new drugs and using pesticide (杀虫剂) to wipe out local mosquito populations. But these measures aren’ t working...and some scientists, like Greg Lanzaro, say that because of drug resistance and population changes, malaria is actually more prevalent now than it was 20 years ago.
Excerpt 3
    Gene therapy and gene-based drugs are two ways we could benefit from our growing mastery of genetic science. But there will be others as well. Here is one of the remarkable therapies on the cutting edge of genetic research that could make their way into mainstream medicine in the coming years.
Excerpt 4
    For years, pediatricians didn’ t worry much about treating hypertension in their patients. After all, kids grow so fast, it’s hard keeping up with their shoe size, let alone their blood pressure. Sure, hypertension in adults places them at greater risk of heart attack and stroke. But nobody likes the idea of starting youngsters on blood-pressure medicine they could wind up taking the rest of their lives. Who knows what previously unheard-of side effects could crop up after five or six decades of daily use? Excerpt 5
    From the health point of view we are living in a marvelous age. We are immunised from birth against many of the most dangerous diseases. A large number of once fatal illnesses can now be cured by modem drugs and surgery. It is almost certain that one day remedies will be found for the most stubborn remaining diseases.
Excerpt 6
    Cardiologists have pioneered the world s first non-surgical bypass operation to turn a vein into an artery using a new technique to divert blood flow in a man with severe heart disease; the keyhole procedure, which avoids the extensive invasive surgery of a conventional bypass, will offer hope to tens of thousands of people at risk from heart attacks.
    Coronary heart disease, where the arteries are progressively silted up with fatty deposits, is responsible in a major industrial country like Britain for more than 160, 000 deaths each year. Although major heart surgery is becoming commonplace, with more than 28, 000 bypass operations in the UK annually, it is traumatic for patients and involves a long recovery period.
One reason for malaria to be more widespread now is that_____.
选项 A、more people have moved to malaria-infected areas
B、mosquitoes have become resistant to pesticides
C、genetically modified mosquitoes still transmit the disease
D、mosquitoes bite as many as 500 million people a year
答案B
解析 在Excerpt 2讲到，科学家希望使蚊子不能传播疾病来消除疟疾。后面讲到“because of drug resistance and population changes，malaria is actually more prevalent now than it was 20 years ago．”由于蚊子对药品的抗力和人口的变化，现在，疟疾实际上比二十年前更普遍。可见A项不符合文意，B项“蚊子对杀虫剂有抵抗力”正确。
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