The relationship between exposure to ______ has not yet been determined.A．ozone and fall i
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The relationship between exposure to ______ has not yet been determined.
A．ozone and fall in lung function
B．ozone and lung diseases such as asthma
C．nitrogen dioxide and worse lung function
D．smog and chronic bronchitis and emphysema
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正确答案：D
解析：判断依据是来自原文中的一句话“It is suspected that long-term exposure to smog may result in chronic bronchitis(支气管炎)and emphysema(肺气肿)，but this has yet to be proven”。那么可见该题答案应该是D，smog and chronic bronchitis and emphysema。本题完全是根据原文原句做答；只是用同义词determine代替了prove。