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根据材料，完成题。
Stem Cell Therapy May Help Repair the Heart

A.Researchers
B.
They
C.
According
D.
All
E.
Healthy
F.1%
G.2%.
Heart
H.In
I.
Current
J.
K.Right
B.Wrong
C.Not

【参考答案】

B
【】B【解析】根据第一段第二句话和第五段第三句话可知，这20名病人也接受手术治疗，题目说这20名接受干细胞注......

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回答题：Natural MedicinesSince earliest days， humans have used some kinds of medicines. We know this because humans have survived. Ancient treatments for injury and disease were successful enough to keep humans from dying out completely.They were successful long before the time of modem medicine. Before the time of doctors with white coats and shiny （发亮的） instruments. Before the time of big hospitals with strange and wonderful equipment.Many parts of the world still do not have university-educated doctors. Nor do they have expensive hospitals. Yet injuries are treated. And diseases are often cured. How? By ancient methods. By medicines that might seem mysterious， even magical （有魔力的）. Traditional medicines are neither mysterious nor magical， however.Through the centuries， tribal （部落的） medicine men experimented with plants. They found many useful chemicals in the plants. And scientists believe many of these traditional medicines may provide the cure for some of today's most serious diseases.Experts say almost 80% of the people in the world use plants for health care. These natural medicines are used not just because people have no other form. of treatment. They are used be-cause people trust them. In developed areas， few people think about the source of the medicines they buy in a store. Yet many widely-used medicines are from ancient sources， especially plants.Some experts say more than 25 % of modem medicines come， in one way or another， from nature.Scientists have long known that nature is really a chemical factory. All living things contain chemicals that help them survive. So scientists' interest in traditional medicine is not new. But it has become an urgent concern. This is because the earth's supply of natural medicines may be dropping rapidly.The passage indicates that ancient treatments for injury and disease were 查看材料

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回答题:Chest Compressions: Most Important of CPRCardiopulmonary resuscitation, or CPR, can save the life of someone whose heart has stopped. The condition is called cardiac arrest. The heart stops pumping blood. The person stops breathing. Without lifesaving measures, the brain starts to die within four to six minutes. CPR combines breathing into the victim&39;s mouth and repeated presses on the chest.__________(46).However, a new Japanese study questions the usefulness of mouth-to-mouth breathing. Thestudy was published in the British medical magazine, The Lancet. Doctors in Tokyo led the research. It examined more than four thousand people who had suffered cardiac arrest. In all the cases, witnesses saw the event happen.More than one thousand of the victims received some kind of medical assistance from witnesses. Seven hundred and twelve received CPR. Four hundred and thirty-nine received chest presses only.__________(47)The researchers say any kind of CPR improved chances of the patient&39;s survival. But, they said those people treated with only chest presses suffered less brain damage.Twenty-two percent survived with good brain ability.__________(48).The American Heart Association changed its guidelines for CPR chest presses in 2005.__________ (49) Gordon Ewy is a heart doctor at the University of Arizona College of Medicine in Tucson. He wrote a report that appeared with the study. Doctor Ewy thinks the CPR guidelines should be changed again. He said the heart association should remove rescue breaths from the guidelines. He argues that more witnesses to cardiac arrests would provide treatment if rescue breaths are not a part of CPR. He says this would save lives __________ (50).Cardiac arrest kills more than 300,000 people in the United States every year. The American Heart Association says about ninety-five percent of victims die before they get to a medical center.（46）__________ 查看材料

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