伞形树木在（）起导游指示作用。
A.出人口处
B.池边
C.拐角
D.路旁
参考答案：A
A．一定小于5Ω
B．一定小于或等于5Ω
C．一定大于5Ω小于10Ω
D．一定大于10Ω
While I was in the university, I learned taking a photo,（）is very useful now for me.
A.it
B.which
C.that
D.what
