由题意得：2-x≥0，
解得：x≤2．
故答案为：x≤2．
一辆长途汽车，在一条公路上单向直线行驶，以20m/s速度行驶全程的14，接着以30m/s的速度行驶完其余的34，求汽车在全程内的平均速度大小？（计算结果小数点后保留一位）
–Did Mrs. King leave a message?
--Yes. She wanted to know_________ this Sunday.
A．who you would go shopping
B．if you would go shopping with her
C．that you will go shopping
D．when will you go shopping with her
