点燃的蜡烛放在正在发声的扬声器纸盒前,可以观察到烛焰在摇曳,这是因为[ ]
A.烛焰被风吹动
B.人的错觉
C.纸盒振动传递能量,带动空气振动
D.以上说法都不正确
答案:C
His red hair and short______made him easy to recognize.
A.statue
B.statute
C.stature
D.status
下列哪种疾病骨髓巨核细胞减少
A.慢性粒细胞性白血病B.缺铁性贫血C.ITPD.急慢性再障E.巨幼细胞贫血