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DAY22
CR:
1.Weaken A
P: native Americans ancestors were part of ancient group much earlier
C: Americans were not first populated by Asian migrants
A right answer
B culture is not related
C maybe they have same ancestors
D tools not related
E not related
2.Strengthen E
F: fill with nitrogen has advantages
P: ?
C: unlikely that nitrogen will widely promoted to the public
A,B not related , C weaken , D can’t say why unlikely E nitrogen has risk , so it can strengthen
RC
P1:gravity exerts challenges on the cardiovascular system of terrestrial animals——example:influence land snakes , but they evolved physiologically
P2: sea snakes : in the water , it’s ok + if were removed from water , bodies with head elevated ——zero blood pressure
P3: land snakes : heart close to head ——by contrast : sea snakes : centrally hearts ——further:arboreal snakes:hearts closer to head + muscular contractions
EADAC |
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