Apex domains cannot have CNAME records.
Question and response
Question
dig tupu360.cn. NS
Answer
tupu360.cn. 5 NS f1g1ns1.dnspod.net.
tupu360.cn. 5 NS f1g1ns2.dnspod.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0