我们知道，一个正方形可以剪成4个小正方形，那么一个正方形能否剪成9个正方形，能否剪成11个正方形(大小不一定要相同)( )
A．前者能、后者不能
B．前者不能、后者能
C．两者都不能
D．两者都能
参考答案：D
解析：一个正方形可以分成相同大小的小正方形：4个、9个、16个或25个，即每4个、9个、16个、25个……小正方形可以合成一个较大的正方形，25＝8+9×1+4×2，则8+1+2＝11恰为11个正方形。(8个小正方形)
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| It is often said that politeness costs nothing. In fact, __1__hearing the phrase "thank you" or "well done" means the same to employees as a modest pay__2__, researchers say. Praise and encouragement also__3__employees more likely to work hard and stay in their jobs, saving on the cost of finding__4__. A third of 1,000 workers__5__said they did not get thanked at all when they did well, and a(n) __6__third said they were not thanked enough. In both__7__, the employees said they felt__8__, meaning they were less likely to be__9__to their jobs and were more likely to look for employment elsewhere. According to the survey, praising employees has the same__10__as a 1 percent pay rise, and works out much__11__for bosses. Three out of four employees said that regular__12__by their bosses was important to them, __13__ only a quarter said they were actually given as much praise__14__they felt they needed. Those doing manual (体力的) jobs were less likely to be given any __15__for doing well. Scottish employees felt__16__undervalued, eight out of ten saying they would like more praise. However, workers in the northeast are less__17__by being buttered up by the boss, as only 69 percent said they felt the__18__to be told "well done" regularly. The research found that words of praise did more than__19__a pleasant place to work-they could __20__increase profits. | ||||
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