使吸入的气体变得清洁的结构有( )
①声带 ②气管、支气管内表面的纤毛 ③ 鼻黏膜 ④会厌软骨 ⑤鼻毛
A:①②③
B:②③④
C:②③⑤
D:①④⑤
小华回顾两年来所学知识时,想到了如图甲、乙两个实验,他进行了如下总结:
— ______ do you have the drawing lessons? The pictures you draw are so beautiful. — Once a week. I began having drawing lessons at the age of five.