Pheromones are substances that serve as chemical signals between members of the
same species. They are secreted to the outside of the body and cause other individuals
of the species to have specific reactions. Pheromones, which are sometimes called
"social hormones," affect a group of individuals somewhat like hormones do an individual
animal. Pheromones are the predominant medium of communication among insects
(but rarely the sole method). Some species have simple pheromone systems and produce
only a few pheromones, but others produce many with various functions. Pheromone
systems are the most complex in some of the so-called social insects, insects that live
in organized groups.
42. The purpose of the second mention of "hormones" in line 4 is to point out
(A) chemical signals that are common among insects
(C) similarities between two chemical substances
예전에 어떤분이 같은 문제로 게시판에 문의가 있었는데
대답해주신 분이 없더라고요.
정답은 C라고 하는데 A는 안되나요?