德国历史上各封建邦国公布的强迫教育法令最早出现于（）世纪。
参考答案：16
一般来说，板块内部地壳比较稳定，板块与板块交界地带地壳比较______．
______ is well known to everyone, I should say, is that a man becomes learned by asking questions.
A．Who
B．It
C．As
D．What
