Apex domains cannot have CNAME records.
Question and response
Question
dig bizcn.com. NS
Answer
bizcn.com. 2 NS dns.bizcn.com.
bizcn.com. 2 NS dns.cnmsn.net.
Authority
The response has no authority records.
Additional
dns.bizcn.com. 2 A 61.240.129.114
dns.bizcn.com. 2 A 180.163.194.215
dns.cnmsn.net. 2 A 61.240.129.147
dns.cnmsn.net. 2 A 180.163.194.139
dns.bizcn.com. 2 AAAA 240c:4082:ffff:ff01:0:d:0:34a
dns.cnmsn.net. 2 AAAA 240c:4082:ffff:ff01:0:d:0:69
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0