阅读理解。
Inside the pleasingly fragrant cafe, So All May Eat(SAME) in downtown Denver ,the spirit of
generosity(慷慨)is instantly noticeable :A donation box stands in place of a cash register. Customers
here pay only what they can afford, no questions asked. A risky business plan, perhaps, but SAME Caf?
has done one unchangeable thing in the Mile High City for six years: Open only at midday, the restaurant
provides poor local can instead volunteer as waiters and waitresses, and dishwashers, or took after the
buildings and equipment for the cafe.
"It's based on trust, and it's working all right" , says co-owner Brad Birky , who started the cafe in
2006. With his wife Libby. Previously volunteering at soup kitchens, the Birkys were dissatisfied with the
often unhealthy meals they served there. "We wanted to offer quality food in a restaurant where everyone
felt comfortable ,regardless of their circumstances," Birky says. SAME's special lunch menu changes daily and most food materials are natural and grown by local farmers. The cafe now averages 65 to 70
customers (and eight volunteers) a day. And the spirit of generosity behind the project appears to be
spreading. In early 2007,one volunteer who had cleared snow for his meals during the long winter said
goodbye to the Birkys," He said he was going to New Orleans to help with the hurricane clear up," says
Birky. 68.What can we learn about the soup kitchens the Birkys previously worked for?
1. What can we learn about the soup kitchens the Birkys prcviously worked for?
A. hey refused to have volunteers.
B. They offered low quality food.
C. They provided customers with a good environment.
D. They closed down because of poor management.
2. According to the passage, which of the following is TRUE?
A. The customers who cannot pay can word as volunteers in stead.
B. More volunteers will go to new Orleans for the hurricane cleanup.
C. Many new cafes will be opened to offer free lunches in the town.
D. The lunch menu has remained the same since the cafe was started.
3. The author's attitude towards running such a caf? is_______
A. unfavorable
B. approving
C. doubtful
D. cautious
的小车在光滑的水平面上以速度
向右做匀速直线运动，一个质量为
的小球从高
处自由下落，与小车碰撞后反弹上升的高度为仍为
≫
，小球与车之间的动摩擦因数为
，则小球弹起时的水平速度可能是
.
.
.
.
，则摩擦力消失，小球在水平方向上的速度不再加速；反之，小球在离开小车之前在水平方向上就是一直被加速的。故分以下两种情况进行分析：
，则水平方向上动量守恒，有
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