参考答案

　　46.A) Not all of them are symptoms of dementia.

　　47.C) Communication within our brain weakens.

　　48.A) Totally forgetting how to do one’s daily routines.

　　49.B) Turn to a professional for assistance.

　　50.D) Staying active both physically and mentally.

　　51.C) They all experienced terrible misfortunes.

　　52.B) The utmost comfort passengers could enjoy.

　　53.A) It was a mere piece of decoration.

　　54.D) The belief that they could never sink with a double-layer body.

　　55.D) She was retired after her naval service.

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