长期用耳机听音乐可能会损伤对声波敏感的细胞,使听力下降;长期玩手机可能会损伤对光敏感的细胞,使视力下降,上述两类细胞分别位于( )
A:外耳道、虹膜
B:鼓膜、瞳孔
C:耳蜗、视网膜
D:咽鼓管、脉络膜
He spends as much time as he can ____ (do) his homework.
Do you like dogs? Yes, I do.