题干
It is dangerous for teenagers to give out too much about themselves on the Internet.
A：information
B：questions
C：ideas
D：knowledge
答案(点此获取答案解析）
A
It is dangerous for teenagers to give out too much about themselves on the Internet.
A：information
B：questions
C：ideas
D：knowledge
，
，
，
，
中，无理数有 （ ）