Read the following passages and then answer the questions.
Dolphins are regarded as the friendliest creatures in the sea. Stories of them that help drowning sailors have been common since Roman times. The more we learn about dolphins, the more we realize that their society is more complex than people have previously imagined. Dolphins look after other dolphins when they are ill, care for pregnant mothers, and protect the weakest in the community, as we do. Some scientists have suggested that dolphins have a language, but it is much more probable that they communicate with one another without needing words. Are dolphins more intelligent than man? Certainly the most common argument in favor of man’s superiority over them is that man can kill them more easily than they can kill us; however, this argument is the least satisfactory. On the contrary, the more we discover about these remarkable creatures, the less we appear superior when we destroy them.
1.In line 11, “On the contrary” is closest in meaning to ……….. .