18. 다음 글에서 밑줄 친 they가 가리키는 대상이 다른 것은?
Geckos are the smallest types of lizards. They are only about one inch long. Geckos got their name from the frequent chirping and clicking noises ①they make (most reptiles don’t make any noises at all). Unlike many other reptiles, ②they frequently live peacefully among humans―probably because they are harmless, ③they are less threatening because of their small size, and their insect diet is helpful to humans. Geckos have tiny, hair‐like coverings on their flattened feet and ④they make them extraordinary climbers. Geckos are able to grip even very smooth surfaces, and ⑤they can climb straight up walls and even walk across ceilings. |