完形填空：

　　67-71 ADABD

　　72-76 CBABD

　　77-81 AADCB

　　82-86 ADBCA

　　翻译答案:

　　87. that they have no solutions so far.

　　88. what most parents are concerned about.

　　89. in case it is getting colder

　　90. decided to start their own business.

　　91. until a doctor discovered it by accident.

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