问题
选择题
函数f（x）=（a2-4a+4）ax是指数函数，则a等于（ ）
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答案
答案：C
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函数f（x）=（a2-4a+4）ax是指数函数，则a等于（ ）
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答案：C
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| Although it was autumn, the snow was already beginning to fall in Tibet. Our legs were 1 heavy and cold that they felt 2 blocks of ice. Have you ever seen snowmen ride bicycles? 3 what we looked like! 4 the way children 5 in long woold coats stopped to look at us. In the late afternoon we found it was so cold that our water bottles froze. 6 , the lakes shone like a glass in the 7 sun and looked wonderful. Wang Wei rode in front of me 8 . She is very reliable and I knew I 9 need to encourage her. To climb the mountains 10 hard work but as we looked around us were surprised by the 11 . we seemed to be able to see for miles. At one point we were so high that we found 12 cycling through clouds. Then we began going 13 the hills. It was great fun 14 as it gradually became much 15 . in the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats, gloves and trousers 16 T-shirts and shorts. In the early evening we always stop 17 camp. We 18 our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind-only the flames of our fire for company. As I 19 beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, 20 our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them. | ||||
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