2. 外语
  3. Malaria is world’s second most common disease causing over【C1】______infections and one million deaths every year.【C2】______it is

Malaria is world’s second most common disease causing over【C1】______infections and one million deaths every year.【C2】______it is

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问题     Malaria is world’s second most common disease causing over【C1】______infections and one million deaths every year.【C2】______it is one of those diseases which is beginning to increase as it develops resistance【C3】______treatments. Even in the UK, where malaria has been effectively【C4】______more than 2,000 people are infected as they return from trips abroad and the numbers are rising.
    【C5】______the fact that malaria has been around for so long, surprisingly【C6】______is known about how to【C7】______or prevent it. Mosquitoes,【C8】______are the carriers of the disease, are attracted to heat, moisture and carbon dioxide but how they sought【C9】______this mixture to repeatedly select one individual for attention over【C10】______is not understood.
    The fight against malaria often seems to focus on the work of medical researchers. But【C11】______is low because malaria is a third world condition and【C12】______troubles the rich, industrialized countries.【C13】______malaria is a disease of【C14】______The richer countries have managed to eradicate malaria by extending agriculture and having proper drainage【C15】______mosquitoes cannot breed. In China, making use of【C16】______impregnated netting around beds reduced infection【C17】______from over 1 million per year to around 65,000. But the search for medical cures goes on. Some researchers still have high hopes for DNA【C18】______vaccines which worked well in trials【C19】______mice. Others are not so confident and expect a wait of【C20】______another 15 years before any significant development.
【C12】
选项 A、never
B、once
C、frequently
D、scarcely
答案D
解析 副词辨析题。疟疾是第三世界国家的疾病，但根据文章首段可知在发达国家英国也有人在度假时染上疟疾后回国，因此只能说富裕的国家几乎不被此疾病烦扰。B选项与过去时态连用，不合语法要求，因此“scarcely：仅仅，几乎不”符合句意。
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