观察显微镜时,双眼的状态是( )
A:只睁开左眼
B:双眼睁开,用左眼看目镜
C:只睁开右眼
D:双眼睁开,用右眼看目镜
如图所示为甲、乙、丙三个物体的“位移﹣时间”图象,下列说法正确的是( )
The water in the river isn't____ (harm). You can drink it without cooking.
造句
①嫉妒②骇人