题目内容
（请给出正确答案）
[单选题]
有关 primitive streak 的描述，错误的是（）
A.由上胚层细胞增殖形成的细胞索
B.头端略大，称为原结
C.原结向内凹陷形成原凹
D.原条所在一端为胚盘的尾端
E.发生在受精后第1周
答案
E、发生在受精后第1周
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题目内容
（请给出正确答案）
A.由上胚层细胞增殖形成的细胞索
B.头端略大，称为原结
C.原结向内凹陷形成原凹
D.原条所在一端为胚盘的尾端
E.发生在受精后第1周
答案
E、发生在受精后第1周
更多“有关 primitive streak 的描述，错误的是（）”相关的问题
第2题
A.from anterior to posterior, as Hensen's node retreats
B.from posterior to anterior, as the primitive streak elongates
C.from the dorsal midline outward, into lateral plate
D.simultaneously along the axis
第4题
According to the passage, primitive ocean life begins to evolve into complex organisms
A．in the middle of December
B．when Earth is cratered
C．at the beginning of November
D．when the land is still a lifeless waste
第5题
第6题
A.grown
B.raised
C.tended
D.cuhivated
第7题
Most Mayan people lived in __________.
A． beautiful cities
B． simple huts
C． primitive caves
D． stone temples
第8题
A.aroused
B.risen
C.raised
D.wakened
第9题
According to the passage, the author seems to be ______.
A．against the education in the very early historic times
B．in favor of the educational practice in primitive cultures
C．quite happy to see an equal start for everyone
D．positive about our present educational instruction
第10题
According to the passage, the "happy few" (Last Line, Para. 3) refers to ______.
A．children who had the privilege of going to school
B．civilized nations that had a lot of schools
C．those countries like Germany, France and England
D．illiterate people in primitive cultures
