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Too much TV viewing is intellectually damaging;_________________ (换句话说), it kills creativity and imagination.

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Doctors have been instrumental in improving living standards in Western society.

Questions 11 to 18 are based on the conversation you have just heard.

A. She missed her friends.
B. She thinks she’s catching another cold.
C. She likes tomato sauce on everything she eats.
D. She has a lot of work to make up.

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The approach to health during the 1970s included the introduction of health awareness programs.

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1998年4月12日，李某与赵某订立书面合同，约定：李某将一台“西湖”牌彩电以1800元卖给赵某，赵某应于合同签订时一次付清全部价款；李某应于4月20日交付彩电；如果违约，应承担违约责任。合同签订时，赵某依约付清了全部价款。4月15日，李某又与孙某达成协议，将该“西湖”牌彩电卖给孙某，价款为2000元。当天，李某将该彩电交给孙某，孙某答应一周内付清价款。后赵某诉到法院，要求李某交付彩电。请综合分析，回答本案涉及的法律问题：关于李某与赵某、孙某的合同效力问题，正确的是( )。 A．李某与赵某的合同有效，李某与孙某的合同无效 B．李某与赵某的合同无效，李某与孙某的合同有效 C．李某与赵某的合同及李某与孙某的合同均无效 D．李某与赵某的合同及李某与孙某的合同均有效

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