—Allan, turn down the TV, please.I      on the phone.
—Oh,sorry.

—What does your brother like doing in his spare time?
—He        watching TV.

It’s eight o’clock. The students      an English class.

The teacher told us that the earth       around the sun.

双曲线与在第一象限内的图象如图,作一条平行于x轴的直线交y₁,y₂于B、A,连接OA,过B作BC∥OA,交x轴于点C,若四边形OABC的面积为3,则k的值为(    )

如图,有一块矩形纸片ABCD,AB=8,AD=6.将纸片折叠,使得AD边落在AB边上,折痕为AE,再将△AED沿DE向右翻折,AE与BC的交点为F,则CF的长为(    )

如图,直线y=x+1与直线y=mx+相交于点P(a,2),结合图形可得出不等式0<mx+≤x+1的解集为(    )

在△ABC中,AB>BC>AC,D是AC的中点,过点D作直线l截△ABC,使得到的三角形与原三角形相似,这样的直线有(    )条.

下列命题中不正确的是(    )

将一副常规的三角尺按如图所示的方式放置,则图中∠1的度数为(    )