In Select component, first option always has active css

[yc-rakuen]

I'm submitting a Bug report

Current behavior

In Select component, the first option would keep active after the second launch dropdown box, whatever you choice. Is it a css bug?

Expected behavior

only selected option bold

Environment

Angular version: 4.0.0

ng-zro-antd version: 0.5.0-rc2

Browser: Chrome (desktop) version  60.0.3112.101
 

[lock]

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