A:that, which
B:when, which
C:which, that
D:when, who
计算: 3x−1 + x−31−x2
问:小明在第____步开始出错,小红在第____步开始出错(写出序号即可);请你给出正确解答过程.
世界上最长的山脉是( )
zhān yǎng____
qí zhì____
xuǎn jǔ____
lǐng xiù____
xú xú shàng shēng____