房地产估价师续期注册的有效期为( )年。
A．一
B．二
C．三
D．四
参考答案：C
Cognitive psychologists hold that language learning is the discovery of the underlying ______ of the language by means of inductive and deductive inference.
若五位数2476a既是2的倍数又是3的倍数，那么a可取几个自然数？[ ]
A．2
B．4
C．5
D．8
