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

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

出自：河南城建学院-大学英语2

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