已知 互为相反数,且 求 的值. 答案:解: x、y 互为相反数,则 y=−x 原式 =(x+3+y+3)(x+3−y−3)=6,即 2x=1 x=12 y=−x=−12故答案为 x、y 的值分别为 12 , −12.用所给词的适当形式填空。Dear Tim, I have a pen friend. Her name is Alice. She 1____ (come) from America. She is twelve years old. She is a school girl. She says China is a 2____ (friend) country. She wants some Chinese friends. She wants 3____ (be) a reporter because she likes to talk with people and 4____ (write) stories. There 5____ (be) twenty students in her class. They come from different 6____ (country). They all can speak English. They 7____ (learn) Chinese now. Her 8____ (parent) are working in China. Her mother is a teacher in a middle school in Beijing. She 9____ (teach) English. Her father is a doctor in a hospital. They have many Chinese friends. They all like 10____ (Chinese) very much. Yours, Tom