Malaria is world’s second most common disease causing over【C1】______infectio

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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. [br] 【C17】

选项 A、proportions
B、percentages
C、rates
D、ratios

答案 C

解析惯用搭配题。感染率infection rate。rate虽有“比例，比值”之意，但在此表示“速度”；proportion表示“比例关系”，可代替ratio使用，但相比的两个量在上下文没有出现时必须用proportion而不能用ratio；ratio指的是“两个量的比值”．强调相比、相除的关系，但是它的两个量必须在上下文出现；percentage表示“百分比”。

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