桌子摆满了同学们送来的礼物,小狗欢欢好奇地想看个究竟.①小狗先是趴在地面上看;②然后抬起了前腿看;③唉,还是站在凳子上看吧;④最后它终于爬上了桌子…,请你根据小狗四次观看礼物的顺序把下面四幅图对应字母正确的排序为____ .
凸透镜在成缩小像时,对光有会聚作用,在成放大像时,对光有发散作用. (判断对错)
下列各项中字形完全正确的一项是( )
— Where does your grandfather live?
— In the countryside. He lives ____ in a big house and often feels____.