— I prefer western food. It's delicious and good for us.
— ? But western food is said to be high in sugar and fat.
A:Is that right
B:How do you know that
C:Do you really think so
D:Who told you that
如图所示,用手将物块压在墙上静止不动,在图中画出物块对墙壁的压力.
为了解全班同学对新闻、体育、动漫和娱乐四类电视节目的喜爱情况,张亮同学调查后绘制了一个扇形统计图(如图),则喜欢体育类节目所对应扇形的圆心角的度数为( )
下列有关生物变异的描述中,错误的是( )