Hong Kong _______ 31st on a 2009 livability survey of world's 140 cities by Economist magazine, the best performance among nine Chinese cities that edged into the list, the China News Agency citing a news report said.

A．ranked

B．ranged

C．listed

D．lined

创新人才使用机制中，一定要体现（）原则

A、公开

B、平等

C、竞争

D、择优