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题目内容
（河南城建学院-大学英语2）
While _______ of rats showed a greater number of brain connections, _______ had a greater density of blood vessels in the brain.
A) the first group / the third group B) the second group / the third group
C) the first group / the second group D) the second group / the first group
A) the first group / the third group B) the second group / the third group
C) the first group / the second group D) the second group / the first group
参考答案