16.7-1.7-1.3=( )
A: 4
B:13.7
C:0.44
D:26
乘车时需要自觉排队,一次上车;参观游览时,要爱护公物 文明古籍和花草树木;观看电影,戏剧时,不要高声交谈喧哗。以上这些表明( )
当心脏房室瓣处于关闭状态而动脉瓣处于开放状态时,心脏的活动状况是( )
做一名合格的公民,我们要做到( )
—I like the photo I took on the beach yesterday. What do you think of it? —Well, really nice!