茸鞭型鞭毛
参考答案：
在电子显微镜下，可见鞭毛渐尖细，表面平滑，没有横生的茸毛，如绿藻门，轮藻门灯。
_________ did the students realize that they were mistaken about spiders.
A．It was until then
B．It was not until then
C．Not until then
D．Not until when
因发育障碍可形成()渗出液积聚于胸膜腔而形成()
A．气胸
B．血胸
C．漏斗胸
D．脓胸
E．连枷胸
