题目

已知函数，（ ， ， ）满足，且，则下列区间中是的单调减区间的是（ ）A. B. C. D. 答案：【答案】A【解析】由可得： ，即，∴，∴，∵，∴函数图象关于对称，∴，∴， 又，∴，∴令， 解得： ， 令， ，∴的单调减区间的是故选：AMy parents ran a small restaurant in Seattle. It was open 24 hours a day, seven days a week, and my first job, when I was six years old, was diner’s shoes. My father had done it when he was young, so he taught me to do it right, telling me to offer to re-shine the shoes if the customer wasn’t .Working in the restaurant was a of great pride because I was also working for the of the whole family. But my father made it clear that I had to certain standards to be part of the team. I had to be punctual, hard-working and to the customers.I was paid for my work I did at the restaurant. One day I made the mistake of Dad I thought he should give me $10 a week. He said, “OK, then how about you me for the three meals a day you eat here? And for the times you bring in your buddies for free sodas?” He I owed him about $40 a week.I remember home to Seattle after being away in the Army for about two years. I had just been to captain and was full of pride as I walked into my parents’ restaurant. The thing Dad said was, “How about you cleaning up tonight?” I cannot it! I’m an officer in the US Army! But it didn’t matter. As far as Dad was , I was just another member of the team. I the mop. Working for Dad had taught me that being loyal a team comes first. It doesn’t matter whether that ________ is involved in a family restaurant or the UN Peacekeeping Force.1.A. blank B. real C. natural D. small2.A. cleaning B. shining C. clearing D. sweeping3.A. how B. what C. when D. where4.A. disappointed B. puzzled C. content D. willing5.A.resource B. defense C. robbery D. source6.A. advantage B. strength C. benefit D. help7.A. look up to B. look forward to C. come up to D. hold on to8.A. generous B. polite C. grateful D. hopeful9.A. never B. ever C. always D. seldom10.A. asking B. persuading C. discussing D. telling11.A. paying B. spending C. costing D. taking12.A. expanded B. wondered C. figured D. scanned13.A. going B. coming C. leaving D. returning14.A. raised B. improved C. aroused D. promoted15.A. right B. first C. just D. only16.A. believe B. make C. help D. catch17.A. appointed B. considered C. concerned D. thought18.A. held up B. reached for C. laid out D. showed off19.A. to B. in C. with D. of20.A. work B. job C. effort D. team