题目

Look, read and choose. 根据情景选择合适的句子，并将其字母标号写在对应的括号中。A. How are you?B. Great! C. Good afternoon, Yifan!D. What’s your name?E. Dad, this is Mr Jones.1. 2. 3. 4. 答案：【答案】1-5 DABCE【解析】略解方程：（1）5x2-7x+1=0；（2）2（x-3）2=x2-9．