下列细胞中的染色体不成对的是()
A:成熟的卵细胞
B:神经细胞
C:受精卵
D:口腔上皮细胞
下列各句中,没有错别字的一项是( )
—Yuzuru Hanyu from Japan won the first gold medal at Pyeongchang Olympics on Saturday in men's single figure skating, Jin Boyang set Chinas best result in the event as the fourth finisher.
如图,在平面直角坐标系中,A(1,2),B(3,1),C(﹣2,﹣1).