关于消防宣传与消防教育培训的说法错误的是（）。
A.原则相同
B.目标相同
C.对象相同
D.内容不同
参考答案：C
—Who's that boy reading in the garden? Is it David?
—It ____be David. I saw him in the classroom just now. [ ]
A. must
B. can't
C. may
D. shouldn't
溜行车组进入调车线前，对其所进行的制动是目的制动。
