师爱具有鲜明的自身特点，这主要包括（）。
A.目的性
B.私人性
C.广泛性
D.科学性
参考答案：A, C, D
已知甲地的海拔高度为150m，乙地的海拔高度为-30m，那么甲地比乙地高______m．
Which statement about the ARJ-21 Advanced Regional Jet is falsea. It is the first homegrown Chinese jetliner for the 21st Century.b. It is of medium range.c. It should start to roll off the production line later this year.d. None of the above.
