A:树木
B:地面
C:行驶的汽车
D:天空中的云
—These pears look .
—Yes.Let's get some.We haven't got any at home.
—Maybe he was busy at that moment.
已知化学方程式X+2O2 CO2+2H2O,下列对X的判断不正确的是()
下列活动不属于排泄的是 ( )