A:You're welcome.
B:Thank you.
C:Really?
(2015•衡阳)一所学校内的所有生物可以看作一个生态系统. (判断对错).
如图是一个计算程序,若输入的值为﹣1,则输出的结果应为____.
The famous piano teacher ______ Robby as a student only because he said it had always been his mother's dream to hear him play the piano.