A：spy on
B：rely on
C：cut back on
D：focus on
小明用量筒量取一定体积的水，开始平视读数为30.0mL，倒出一部分水后，仰视剩余水的体积为20.0mL，小明实际倒出水的体积（ ）
判断对错.
半径相同的一个整圆的周长一定比半圆的周长长
①物理性质：颜色状态____、熔点____、硬度____、密度____②化学性质：____．
It was the boy, rather than his brothers, that _________ for what they had done.
