School violence ______ much attention of the whole society and people are calling on the government to make laws against it as early as possible.
A:drew
B:will draw
C:has drawn
D:was drawing
科学探究是学习和研究生物学的重要方法.下列关于“尝试探究水温变化对金鱼呼吸次数的影响”实验的相关叙述中,正确的是( )
如图图形中,阴影部分面积相等的是( )
下列关于水沸腾的实验说法正确的是( )