The association between ______ has not yet been found in Australia.A．ozone levels and hosp
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The association between ______ has not yet been found in Australia.
A．ozone levels and hospital admissions for asthma
B．hazy days and more asthma attacks in children
C．the levels of particles in the air and death rates
D．high levels of pollution and more. symptoms
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正确答案：C
解析：参看原文Recently an association has been found between the levels of particles in the air and death rates in North American cities．The reason for this association is not understood and as vet there is no evidence this occurs in Australia．意思是说，最近发现北美空气中微粒的浓度与死亡率之间存在联系，但是原因尚不知晓，而且在澳大利亚并未发现此类现象。