Jane looked carefully at ______ in the mirror before going outside.
A:her
B:him
C:herself
D:himself
图是常用指甲刀的实物及结构示意图,下列说法中不正确的是()
① xx−2−1x2−4=1
② xx−1−1=3x+1 .
下图描述的是绿色植物﹣﹣大豆的一生.请据图分析,并回答下列相关问题: