It was a mystery for weeks in a neighborhood in Grand Chute, Wisconsin. On garbage days, bins suddenly appeared back at their garages(车库). “It was so strange because all of a sudden our garbage cans(垃圾箱) were just showing up,” Melody Luttenegger said.

“We have such a long driveway(车道) and I thought maybe the garbage company is bringing garbage cans, or our neighbours…” she said. “I asked my husband, and he’s like, ‘no, I’m not bringing the garbage cans up’.”

Melody decided to find out who it was. The day before Christmas Eve, she wore warm clothes and waited outside after the garbage truck left. It turns out, a 75-year-old man who lives a few streets over is the person responsible for the act of kindness. “When I retired, I got sick of doing nothing, so I started going around and picking up garbage cans. Not just certain ones, everyone’s,” Dick Pontzloff said.

He rides his bike through the neighborhood, stopping at each house to walk the bin up the driveway. “For someone to just do that, it doesn’t go unnoticed,” said Melody. “You know the kindness that strangers give is an unexplainable feeling. And he doesn’t even realize how nice of an action it is and how much we appreciate it.

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1.To her _________, Melody Luttenegger found the bins at her garage.

A joy

B sadness

C surprise

D excitement

解析：选C。C细节理解题。根据第一段的“It was so strange because all of a sudden our garbage cans(垃圾箱) were just showing up”可知，梅洛迪·卢特内格尔看到自家的垃圾箱出现在车库，觉得非常奇怪。故选C。

2.Who didn’t Melody think might return the bins?

A Her husband.

B Her neighbour.

C Dick Pontzloff.

D The garbage company.

解析：选C。C细节理解题。根据第二段可知，梅洛迪想过可能是垃圾回收公司或是邻居把垃圾箱放回车库的，也想过可能是自己丈夫做的，但她绝对没有想过是一位素昧平生的老者迪克·庞兹洛夫做的，故选C。

3.When did Melody solve the mystery?

A On December, 23.

B On December, 24.

C On December, 25.

D On December, 26.

解析：选A。A细节理解题。根据第三段的“The day before Christmas Eve, she wore warm clothes and waited outside after the garbage truck left.”可知，圣诞前夜的前一天(即12月23日)，梅洛迪穿着暖和的衣服，在外面等候，一探究竟。故选A。

4.Why did the 75-year-old man pick up garbage cans?

A To kill the time.

B To finish his work.

C To serve others as before.

D To thank Melody for her help.

解析：选A。A推理判断题。根据第三段“When I retired, I got sick of doing nothing, so I started going around and picking up garbage cans.”可知，退休后，迪克厌倦了无所事事，所以他开始四处走动，搬运垃圾箱。由此推断他是为了打发时间才这么做的，故选A。

5.According to the last paragraph, we know that _________.

A Melody wants to do something for Dick

B Dick did good things for nothing in return

C Melody can’t understand why Dick did it

D Melody is very grateful to Dick’s kindness

解析：选D。D细节理解题。根据最后一段的“You know the kindness that strangers give is an unexplainable feeling. And he doesn’t even realize how nice of an action it is and how much we appreciate it.”可知，梅洛迪一家对于迪克的举动表示非常感激。故选D。