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.
【C13】
选项 A、It makes sense that
B、It is suggested that
C、It is true that
D、It is high time that
答案C
解析 语义衔接题。四个选项都是由it引导的形式主语句型，前文提到疟疾是第三世界国家的疾病，因此“疟疾来自贫穷是真的”，选C。
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