下列说法正确的是( )
A:布朗运动是指液体分子的无规则运动
B:物体的内能是物体内所有分子动能和分子势能的总和
C:温度升高,物体内每个分子的动能一定增大
D:温度高的物体内能一定大
—What do you think of your new job, Jim?
—It's _______. I do exactly the same thing every day.
下列有关病毒的说法,错误的是( )
With the loss of labor,the old farmers ________at home had to choose less laborintensive crops.
My friend Ben _________ Science.