A:2
B:3
C:4
D:5
— What's up? You look _____ right now.
— I'm afraid to take the exam. I'll let my mother _____ if I can't pass it.
如图为某生物细胞中基因位于染色体上的示意图,对该图叙述正确的是( )
读图,回答下题
如图,正确表示了光从空气进入玻璃中的光路图是( )