解析　宾语从句中you think是插入语，从句中缺少主语，which意思不对，故选what。

　　Ⅱ.阅读理解

　　A

　　In 1978，I was 18 and was working as a nurse in a small town about 270 km away from Sydney，Australia.I was looking forward to having five days off from duty.Unfortunately，the only one train a day back to my home in Sydney had already left.So I thought I’d hitch a ride (搭便车)．I waited by the side of the highway for three hours but no one stopped for me.Finally，a man walked over and introduced himself as Gordon.He said that although he couldn’t give me a lift，I should come back to his house for lunch.He noticed me standing for hours in the November heat and thought I must be hungry.I was doubtful as a young girl but he assured(使……放心) me I was safe，and he also offered to help me find a lift home afterwards.When we arrived at his house，he made us sandwiches.After lunch，he helped me find a lift home.

　　Twenty­five years later，in 2003，while I was driving to a nearby town one day，I saw an elderly man standing in the glaring heat，trying to hitch a ride.I thought it was another chance to repay someone for the favour I’d been given decades earlier.I pulled over and picked him up.I made him comfortable on the back seat and offered him some water.

　　After a few moments of small talk，the man said to me，“You haven’t changed a bit，even your red hair is still the same.”

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