题目

方程组的解是（ ）A. B. C. D. 答案：【答案】A【解析】利用加减消元法解方程组即可.，将①式与②相加得，3x=6，解得，x=2，将其代入①式中得，y=1，此方程组的解是 . 故选A．五、句型转换。21按照要求完成句子。（1）Must we drink eight cups of water every day? (作否定回答)No, .（2）You'd better ask our computer teacher for help. (改为否定句)You'd better our computer teacher for help.（3）I play basketball twice a week. (对画线部分提问) do you play basketball?（4）You mustn't smoke here. (同义句转换) here!（5）What's wrong?(同义句转换) What's ?