Apex domains cannot have CNAME records.
Question and response
Question
dig 35yiku.com. NS
Answer
35yiku.com. 5 NS ns-1903.awsdns-45.co.uk.
35yiku.com. 5 NS ns-1077.awsdns-06.org.
35yiku.com. 5 NS ns-427.awsdns-53.com.
35yiku.com. 5 NS ns-1409.awsdns-48.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0