解析　细节理解题。根据第二段第一句"Latest researches from Cancer Research UK show smoking is the biggest avoidable risk factor(因素), followed by unhealthy diets."可知吸烟是导致癌症的第一大可以避免的因素，不健康的饮食占第二位。故答案为C。

22．According to Professor Max Parkin, .

A．it's OK to drink wine during festivals

B．the causes of cancer are still unclear now

C．people should stop having unhealthy food completely

D．a healthy life style will protect us from cancer

答案　A

解析　细节理解题。在文章第五段中Professor Max Parkin提到"Of course everyone wants to enjoy some extra treats during the Christmas holiday so we don't have to stop eating beef pies and drinking wine..."可知他的观点是节日饮酒也可以。故答案为A。

23．By saying the underlined words in Paragraph 6，Professor Max Parkin means we can .

A．help others

B．improve our lives

C．discover cancer early

D．decrease our cancer risk

答案　D

解析　句意理解题。由划线句前的转折连词but可知前后意思相反，but前意为"健康饮食不能保证不患癌症"，故后句为通过积极地措施可以"减少患癌症"。故答案为D。

24．What's the main idea of the text?

A．Most cancers are caused by smoking.

B．Cancer is greatly linked to our lifestyle.

C．There are different factors that lead to cancer.

D．Public awareness should be raised to prevent cancer.

答案　B

解析　主旨大意题。本文作者主要介绍了健康生活可以减少患癌症，由此可知答案为B。

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