My brother and I look different we are twins. [ ]
A. though
B. because
C. but
D. then
答案:A
为人民服务是我国政府工作的宗旨。
住宅户内采用螺旋式楼梯,一般要求梯级在距内侧( )处的宽度不宜小于( )。
A.200mm,250mm B.250mm,220mm C.220mm,250mm D.220mm,220mm