A:all her childre
B:whose all childre
C:all of her childre
D:all of whose childre
科学家已研制出新型的氧分子O4,对其说法正确的是
东汉时期,蔡伦改进了造纸术,他造的纸称为“蔡侯纸”,其优点是( )
His i____ is approximately 8000 dollars a month.