吸烟能使痰增多,与此有关的结构是[ ]
A.鼻黏膜纤毛上皮
B.肺泡壁的单层扁平上皮
C.气管、支气管黏膜的纤毛上皮
D.气管、支气管黏膜的腺上皮
答案:C
My grandmother is too ___________, she can't lift up the heavy box. [ ]
A. old
B. young
C. strong
D. heavy
1000多年前,()就已经是重要的粮食产地,以“江南鱼米之乡”著称于世。
A.江汉平原
B.两湖平原
C.巢湖平原
D.鄱阳湖平原