单项选择题

To the professional linguist, there is no superiority of any language. Therefore, it is well-accepted in the field of linguistics that there exist no higher or lower grades among languages.
People once thought of the languages of backward groups as undeveloped forms of speech, consisting largely of rough and simple sounds. It is possible that language in general began as a series of simple sounds. But it is a fact established by the study of "backward" languages that no spoken tongue answers that description. Most languages of "backward" groups are extremely complex pieces of tool for the transfer of ideas. They "fall behind" the western languages not in their sound pattern or grammatical structures hut only in their vocabularies. The sound pattern or grammatical structures usually are fully adequate for all language needs. The vocabulary reflects the objects and activities known to their speakers.
There are two things to be noted. Firstly, all languages seem to possess ways for vocabulary expansion. Vocabulary expands either by putting together its own words or by borrowing words from other languages. Secondly, the "backward" languages are different from ours. The objects and activities which require distinction are often surprisingly numerous and complicated.

What does the word "superiority" (Line 1, Para. 1) mean（）

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