一物体在做匀速直线运动，它在前10秒内通过150米路程，它在中间半分钟内通过的路程是 ____ 米．它在最后5秒内的速度是 ____ 米/秒．
已知ξ～N（3，a2），若P（ξ≤2）=0.2，则P（ξ≤4）=（ ）
—
— K-E-Y, key.
关于温度、内能和热量，下列说法正确的是（ ）
一组数据：2016，2016，2016，2016，2016，2016的方差是____．
Juliette's website
Name
1 Girls
Development
At ten, Juliette drew 2 little girls.
She started the website with the help of her 3.
At first, there were only some simple pictures on the website.
Now, it has message boards, chat rooms, 4 , music and more.
Aim(目的)
To help the girls learn more about cultures,5 and become better.
