71. After all, not even _____ speakers of English find it easy to do some reading aloud correctly in RP(Received Pronunciation).

A．national

B．native

C．natural

D．non-stop

（）是诗人屈原早期创作的一首咏物述志诗诗人以拟人化的手法赞美橘树受命不迁、秉德无私的品性并将它作为自己的师表。