题目

—Do you like ping-pong? — No, I think it's _________. A . interesting B . fun C . boring D . relaxing 答案：C15．解不等式组：$\left\{\begin{array}{l}{3x+1≥2x（1）}\\{2x-3≤5（2）}\end{array}\right.$，并把解集在数轴上表示出来．