A：气体摩尔体积指1mol任何气体所占的体积约为22.4L
B：不同的气体，若体积不同，则它们所含的分子数必定也不同
C：一定温度和压强下，气态物质的体积大小主要由构成气体的分子大小决定
D：一定温度和压强下，气态物质的体积大小主要由构成气体的分子数决定
以下物理量中，以科学家焦耳的名字作为单位的是（ ）
Yesterday，Amy and Mary went to the zoo by bike. They saw pandas, lions, monkeys and elephants. They were very happy. They were thirsty, so they bought a watermelon. Amy carried the watermelon on her bike. But it fell off her bike and bumped her foot(脚).
怀化市鹤城区某中学部分同学计划暑假到怀化市一处著名景区旅游，经过讨论后，他们选择下列四景区中距离最近的一处，该景区
He ____ (regret) not to tell his mother the truth.
下列句中加线的“为”字的意义不同于其他三项的一项是( )
