题干

有经验的柴油机维修师,不用任何仪器,只是靠近柴油机排气管口观察和闻一下,并将手伸到排气管口附近感觉一下尾气的温度,就能初步判断这台柴油机的节能效果.在同样负荷的情况下,关于柴油机的节能效果,下列判断中正确的是(  )

A:尾气的温度越高,柴油机越节能

B:尾气的柴油味越浓,柴油机越节能

C:尾气的温度越低,柴油机越节能

D:尾气的颜色越发黑,柴油机越节能

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答案(点此获取答案解析)

C

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    Tom Costello was once afraid of homeless Americans. “I was so afraid that if I saw a homeless person walking down the street, I'd cross the street,” he said.

    That changed seven years ago after his wife, Nancy, a volunteer at a homeless shelter, persuaded him to help with a holiday dinner for shelter residents. Tom remembered going to a store and buying socks for the residents. He knew many of them were in need of clothing.

    At the shelter, Tom said, he dropped a pair of socks into a bag for a woman. She asked him if she could have socks for a friend who wasn't with her that day. He gave her another pair. “She started to cry and told me that nobody had ever given her socks before,” Tom said, “Then she reached out and gave me a hug.” That experience at the shelter helped Tom end his fear of the homeless.

    It also led him to set up a group called “The Joy of Sox.”, which borrows from a name of a popular book. The group collects socks from donors and gives them mostly to shelters in the area where Tom and Nancy live. It has been expanding its reach and provides socks to homeless shelters in 21 states and other three countries now.

    Why socks? Tom explains that some Americans give food, coats and other clothing to shelters. But donating socks is not something most people think about. And, he said, socks are very helpful at keeping people warm, especially in cold weather. A man named Kiwi,who has lived in homeless shelters, said most of the time he could find enough food through shelters and soup kitchens. But socks were much more difficult to get, he noted.