— Is this your desk?
— Yes , _____ . [ ]
A. this is
B. that is
C. these are
D. it is
答案:D
绘一张学校操场平面图,采用下列哪个比例尺比较合适( )
A.1:1000
B.图上1cm等于实地距离20km
C.140000000
D.
格鲁克歌剧改革的目的是()。