问题
选择题
飞机上升了-50米,实际上是
A．上升50米
B．下降-50米
C．先上升50米,再下降50米
D．下降50米
答案
答案：D
因为“正”和“负”相对，所以，飞机飞行时比原来的高度高，即上升规定为“+”，
则飞机飞行时比原来的高度低，即下降为“-”．
故-50米表示下降了50米．
故选D
搜题请搜索小程序“爱下问搜题”
飞机上升了-50米,实际上是
A．上升50米
B．下降-50米
C．先上升50米,再下降50米
D．下降50米
答案：D
因为“正”和“负”相对，所以，飞机飞行时比原来的高度高，即上升规定为“+”，
则飞机飞行时比原来的高度低，即下降为“-”．
故-50米表示下降了50米．
故选D
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| I live in Albuquerque, New Mexico, and some homeless people wander around. I often gave money to them, feeling 1 for their bad luck. But later I became a single mom with no home, a huge debt. As a result, I 2 giving and became very 3 . Things started to 4 for me. Again I had a home, and plenty of food, and I started to 5 myself out of debt. One day we saw a homeless person with the 6 , "Will work for food." I 7 . My daughter said, "Mommy, you 8 to give to those people in 9 ." I replied, "Honey, they just use that money for alcohol (酒) or other 10 things." She didn't respond. But when I said that, it didn't feel right. Three days later, I was driving to 11 my daughter from school. A man was standing on the corner, and something deep 12 me said, "Just help him." 13 I rolled down my window, and he ran over happily, saying "God bless you, I only need 77 cents." I 14 into my pocket and strangely enough, there sat three quarters and two pennies. I scooped(抓起)it up and gave it to him. He 15 tears in his 16 , "Wow, you just made it 17 for me to see my mom for Christmas! Thank you; the bus that had this great sale is 18 in 20 minutes!" It was a moment I’ll never forget. I think that man won’t forget it either, 19 I was the one who got the best 20 in life - GIVING. | ||||
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