______ everyone is here, let's begin our meeting.
A:Unless
B:Since
C:Although
D:When
下图是制作“洋葱表皮细胞临时装片”实验的部分步骤,正确的操作顺序是( )
如图,直线y=kx﹣2(k>0)与双曲线 y=kx 在第一象限内的交点R,与x轴、y轴的交点分别为P、Q.过R作RM⊥x轴,M为垂足,若△OPQ与△PRM的面积相等,则k的值等于____.
— I hear you have to get up early in the morning.
— Yes, it is one of the ________ in my family.