Why was 黄河为什么是黄色的 marked wrong please? Is it wrong, poor but acceptable phrasing, or also correct?
Correct phrasing, should be accepted
It's still not accepted.
I just received a notification that it is now accepted (2019-04-24).
I don't know if it's accepted, but 黄河为什么黄？ should be. Please report it if it's not.