问题
选择题
已知函数y="1-x+sinx" ，则
A．函数为R上增函数
B．函数为R上减函数
C．在(0, π]上单调递增，在[π,2π) 上单调递减
D．在(0, π]上单调递减，在[π,2π) 上单调递增
答案
答案：B
因为
,所以此函数在R上是减函数.
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已知函数y="1-x+sinx" ，则
A．函数为R上增函数
B．函数为R上减函数
C．在(0, π]上单调递增，在[π,2π) 上单调递减
D．在(0, π]上单调递减，在[π,2π) 上单调递增
答案：B
因为,所以此函数在R上是减函数.
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| When I was in junior high, the eighth-grade bully (欺凌弱小者) struck me in the stomach. Not only did it 1 , but the shame and embarrassment were almost impossible to bear. I wanted 2 to even the score (摆平)! I 3 to meet him by the bike racks the next day and let him have it. For some reason, I told my plan to Nana, my grandmother-big 4 . She gave me one of her hour-long 5 . It was a total 6 , but among other things, I vaguely 7 her telling me that I didn't need to worry about him. She said, "Good deeds beget (产生) good results, 8 evil deeds beget bad results." I told her, in a nice way, that I thought she was right. I told her that I did good things all the time, and all I got 9 was a strike in the stomach. She stuck to her opinions, 10 . It 11 me 30 years to understand the 12 of her words. Nana was living in a board-and-care home in Laguna Hills, California. Each Tuesday, I 13 and took her out to dinner. We drove to a nearby simple little restaurant. I 14 pot roast for Nana and a hamburger for myself. The food arrived and as I dug in, I noticed that Nana wasn't eating. She was just staring at the food on her plate. 15 my plate aside, I took Nana's and cut her meat into small pieces. I then placed the plate back. 16 she very weakly, and with great difficulty, forked the meat into her mouth, I was struck with a(n) 17 that brought instant tears to my eyes. Forty years 18 , as a little boy sitting at the table, Nana had always done the same to me. It had taken 40 years, but the good deed had been 19 . Nana was right. We harvest exactly 20 we sow. "Every good deed you do will someday come back to you."What about the eighth-grade bully? He ran into the ninth-grade bully. | |||
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