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阅读理解 Six months after a Chinesescientist was widely condemned for helping to make the world's first gene­editedbabies, he remains out of public view, and new information suggests that othersmay be interested in undertaking the same kind of work outside the UnitedStates. A clinic in the United ArabEmirates city of Dubai emailed scientist He Jiankui to seek training in geneediting, Stanford University bioethicist Dr. William Hurlbut said ahead of aspeech Tuesday at the World Science Festival in New York. Hurlbut, whose advice He oftensought, said He told him that scientists from multipl20．已知函数f（x）=lg（3+x）+lg（3-x）．（1）求函数f（x）的定义域；（2）判断函数f（x）的奇偶性，并说明理由．