在长16厘米、宽9厘米的长方形彩纸上最多能剪下几个边长为8厘米的正方形纸片？剩下的彩纸面积有多大？
以长为边最多可以剪下16÷8=2个，
以宽为边最多可以剪出9÷8≈1个，
所以最多可以剪出2×1=2个边长8厘米的正方形，
剩下的面积是：16×9-8×8×2，
=144-128，
=16（平方厘米），
答：最多可以剪下2个正方形，剩下的面积是16平方厘米．
阅读短文，然后根据内容从Ａ、Ｂ、Ｃ、Ｄ中选出可以填入空白处的最佳选项。 With a determined(坚定的) look on his face, Chicago’s Michael McCarthy held on to the banister(扶手) and climbed to the top of the Willis Tower not long ago. The Tower stands 1,451 feet(442 meters) tall, the＿1＿ building in the US. As he got to the last step, McCarthy ＿2＿ fell down, but that didn’t stop him. The 14-year-old boy finally finished climbing the 2,109 steps and arrived at the top, where he ＿3＿ cheers from many people. “I just want to show people that ＿4＿ a kid with no legs can do it, anyone can do it,” McCarthy said. McCarthy, who was born without legs, has to wear prosthetic legs(假肢) and use a stick to walk. But McCarthy has a strong 5 . He believes having a disability(残疾) shouldn’t stop anyone 6 achieving his or her success. He has been in a special school 7 he was four. When he decided to climb the Willis Tower, his teacher, Jeff Kohn, was 8 by his determination(决心) and offered to help train him. They 9 more than ten hours practicing climbing stairs and keeping balance with the prosthetics and sticks on the steps every day. “ 10 seems that he never knows how difficult it is. 11 I was so tired that I asked him to rest for a day,”said Kohn. “But he said he was still full of energy and wanted more 12 .” Kohn always walked with McCarthy for the climb. “I 13 the last 10 floors, he went faster,” said Kohn. “He’s the most cravensportsmanI’ve ever trained.” McCarthy said he was 14 of himself and that the tower now holds special meaning. “When I’m older, I’ll 15 to the building and say ‘Look at this building I climbed’,” he said.
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