1. In     area of rice-growing,Professor Yuan Longping is     expert.

1. the;an in the area of在..... 的領(lǐng)域；expert是可數(shù)名詞，而且以元音音素開頭，因此用an。

題目來源：2015年全品作業(yè)本高中英語必修1外研版 > Module 5 A Lesson in a Lab

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