Smokers tend to be more successful in keeping weight off than non­smokers, slightly reducing the risk.But many of them don't have good lungs.Thus, in another way, they also face risks.

　　As for why extra weight leads to excess cancer death rate, there's no clear agreement.But the decrease in vitamin D in obese people seems a likely factor.Vitamin D is known to have a role in preventing cancer.Also, there is a simple fact that obesity makes the management of cancer more difficult.Although for now there is no simple answer to why obesity increases a person's cancer risk, all we know for certain is that the risk is real.

　　5.The passage is mainly concerned with the relationship between ________.

　　A．diet and cancerB．body weight and cancer

　　C．sex and cancer

　　D．smoking and cancer

　　6．The author develops the passage mainly through ________.

　　A．time order

　　B．space order

　　C．analysis and comparison

　　D．figures and examples

　　7．The underlined word “spanning” in the first paragraph probably means “________”．

　　A．lasting B．including

　　C．happening

　　D．changing

　　8．According to the passage, what can we learn about the study?

　　A．There is a clear explanation concerning why obesity leads to more cancers.

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