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Passage Three Questions 31 to 35 are based on the following passage. One of the most exciting races ever run is now in progress between doctors fighting malaria(疟疾)and mosquitoes. According to the most recent counts 225 million people a year suffer attacks of malaria and more than two million die. Public health workers around the world are doing all t11ev can to destroy malaria before the mosquitoes that pass on the disease become resistant to the poisons now used against them. It’s a race against time and against difficulties，with millions of lives in danger and the chances of winning not in man’s favour. Malaria，it is true，has been practically wiped out in thirteen countries. including the United States，and is under attack in many others. But it is equally true that in some parts of the world certain A. all countries B. some countries C. no countries D. most countries 更多"Passage Three Questions 31 to 35 "的相关试题: [单项选择]
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