单项选择题

已经退化成几条平行皱襞的乳头是（）

A.丝状乳头
B.菌状乳头
C.轮廓乳头
D.叶状乳头
E.舌根淋巴组织

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热门试题

单项选择题

The author’s purpose of writing this passage is to（）.

A．alert readers to the scarcity of natural resources
B．call for more research on the influence of geographical environment
C．introduce different elements in character cultivation
D．draw more attention to the health condition of mankind

单项选择题

Which is true about “mass production” according to the author?（）

A．It promotes further development in manufacturing systems.
B．It defines the Second Wave economy and will last.
C．It involves intensive information, automation, and customization.
D．It is becoming dated for the present economy.