问题
单项选择题
如图所示，ABCD为正方形，DE=4时正方形的面积是（）。
A.A
B.B
C.C
D.D
答案
参考答案：D
解析：
△CED是一个等腰直角三角形，斜边DE=4，
故直角边
，
正方形ABCD的面积S=CD2=
=8，故正确答案为D。
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如图所示，ABCD为正方形，DE=4时正方形的面积是（）。
A.A
B.B
C.C
D.D
参考答案：D
解析：
△CED是一个等腰直角三角形，斜边DE=4，
故直角边，
正方形ABCD的面积S=CD2==8，故正确答案为D。
It was the second day of a winter holiday in Queenstown, New Zealand, three years ago. When we decided to explore the beautiful scenery, our landlady 36 us,“Make sure you are well wrapped up today. The weather is 37 . Head back when you see snowfall.” The day was bright and sunny, and I started to wonder if she was being too cautious. When snow began to fall at 6:00 pm, I was not worried, thinking we’d have no 38 in catching a taxi back. However, we waited for a while, and all the drivers shook their heads when told of our 39 . The first driver passed by and gave me a card with a number for me to 40 help. I was filled with 41 , but I had no choice but to lead my three sisters to a nearby place to make the 42 . Then a taxi drew up and we climbed in. The driver did not appear very friendly. Then the light streaming from his headlights showed very 43 why no taxi wanted to take us to our hotel. And I began to understand the driver’s apparently unfriendly silence — he was worried. The steep incline (斜坡) ahead was 44 with snow. The taxi slowly made its way up the hill. Suddenly, we came to a dead stop, and the driver turned to us. “Look! It is very 45 to go forward. You have to get out and walk. If I drive any further, the taxi will slide back,” he said. “Er ... can you keep your headlight on and help my elder sister? The rest of us will follow you up,” I said. The driver 46 . We made it safely back to our hotel. Even though it 47 for the rest of the days, we could see the silver lining in the cloud(一线希望): the generous soul who helped us.
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