It's said that if people have positive attitudes, their body may ________ a kind of chemical that helps to fight illnesses.

It's said that if people have positive attitudes, their body may ________ a kind of chemical that helps to fight illnesses.

A.produce B.develop C.manage D.invent

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【答案】A 【解析】 考查动词词义辨析。句意：据说如果人们有积极的态度,他们的身体会________一种能帮助抵抗疾病的化学物质。produce产生；develop发展；manage管理；invent发明。根据句意可知此处指“产生”。故选A

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