下列说法不正确的一项是（   ）

质量为10kg的物体，在变力F作用下沿x轴做直线运动，力随坐标x的变化情况如图所示．物体在x＝0处，速度为1m/s，一切摩擦不计，则物体运动到x＝16m处时，速度大小为（　　）

在容积不变的密闭容器中，一定条件下发生反应：2A(?)B(g)＋C(s)，达到化学平衡后，升高温度，容器内气体的密度增大，则下列叙述正确的是   

    Hello! My name is John. I'm a boy. I'm eleven years old. I have three friends. They are May, Peter and Xiao Mao. May is a girl. She is twelve years old. She is from Canada. Peter is a boy. He is thirteen years old. He is from China. Xiao Mao is a boy. He is two years old, He likes eating meat. Haha, he is a dog!

根据上面短文的意思判断下面的句子是否正确。