题目

计算： ． 答案：6【分析】 根据负指数幂、零次幂及三角函数值可进行求解． 【详解】 解：原式 = ． 【点睛】 本题主要考查负指数幂、零次幂及特殊三角函数值，熟练掌握负指数幂、零次幂及特殊三角函数值是解题的关键．The tenth “Walk to School Week” had been started in Northern Ireland in 2012. The idea of this activity was to reduce the 1. n umber of cars on the road during the rush hour of the day.This year, the theme of “Walk to School Week” was “ Step Forward in Time ”. This activity encourages children to develop the 2. h abit of green travel.“ It would be great 3. i f more people leave their cars at home and take their children to school on foot. It saves money and makes the traffic 4. b etter around school gates，’’ said Andy Bready, one of the organizers of the activity. He thought it was a lot of fun， and was also good for people’s 5. h ealthIn fact, one fifth of people around Northern Ireland use a car 6. d uring the rush hour of the day to pick up their children after school. But many of these children live very 7. c lose to school. 8. W alking to school takes them less than ten minutes!1. n  2. h _3. i  4. b_5.h_ 6.d_ 7.c_ 8.    W_