A:35
B:−35
C:45
D:−45
辨题:我国的人民民主具有广泛性,所以我国的一切公民都享有民主。
— Did you see Anna after class?
— I saw her leave the classroom, but I didn't notice __________after that.
有12米长的木料,要做成一个如图的窗框。如果假设窗框横档的长度为x米(窗框的宽度忽略不计),那么窗框的面积是 ( )