Apex domains cannot have CNAME records.
Question and response
Question
dig chunhua1989.org. NS
Answer
chunhua1989.org. 5 NS ns-122.awsdns-15.com.
chunhua1989.org. 5 NS ns-614.awsdns-12.net.
chunhua1989.org. 5 NS ns-610.awsdns-12.net.
chunhua1989.org. 5 NS ns-1186.awsdns-20.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0