[问题] 一题生物循环求解

楼主: garytajen (gary)   2016-03-09 20:54:15
In which animal does blood flow from the pulmonary circulation to the heart be
fore circulating through the rest of the body?
A)frog
B)fish
C)earthworm
D)clam
作者: milletshw (正月)   2016-03-09 21:01:00
D是开放式循环
楼主: garytajen (gary)   2016-03-09 21:58:00
答案是蚯蚓>"<
作者: matt7618 (matt)   2016-03-09 22:14:00
a会先经过皮肤,b不用肺,而且是单循环
作者: janet0305 (星霜)   2016-03-09 23:13:00
蚯蚓没有肺 应该是青蛙吧
楼主: garytajen (gary)   2016-03-10 11:30:00
可是答案是蚯蚓

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