读句子,把人物和动作图片搭配起来。
①Mary is going to read a book.____
②Bob is going to buy a pair of glasses.____
③The boys are making a poster.____
④The girls are going to act a play.____
A. B. C. D.
不等式5-x2>4x的解集为( )
电动自行车两刹车手柄中各有一只开关S1和S2.在行驶中用任意一只手柄刹车时,该手柄上的开关立即断开,电动机停止工作.如图电路符合要求的是( )