题目内容
_________diseases, these diseases are relatively severe but usually last a short time._________diseases, these diseases are often less severe but are likely to be continuous or recurring for long periods._________diseases, these diseases are intermediate between the above two types of diseases, not being as severe as _______ infections nor as long-lasting as_________ disorders.
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A characteristic group of symptoms and signs that accompanies a disease is called a _________. Some complex disorders even have “__________” in their names. Such as Down _________, acquired immunodeficiency ___________(AIDS).
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