—I think it's important to________local businesses by buying locally.
—I agree with you.
A:consider
B:support
C:agree
D:confirm
纪实片《穹顶之下》引起了全社会对环境污染的广泛关注.PM2.5是造成雾霾的主要因素,呼吸道对其几乎没有净化作用.下列说法正确的是( )
(1+i)20-(1-i)20的值是( )
如图示为教学投影仪,在这里平面镜的作用是____ ,透镜的作用是____ ,把投影片放在教学用的投影仪上,如果要使屏幕上得到更大的清晰的像,如图所示,应使投影仪____ (填“远离”或“靠近”)屏幕,并把透镜向____ (填“上”或“下”)移动.