Find the word that differs from the rest in the position of the main stress. A. mature B. nature C. culture D. measure

The word which differs from the rest in the position of the main stress is

A - Mature.

One way to detect where the stress lies is by pronouncing all the words and finding the odd one of the four.A better and more technical way is to examine the phonetic spelling for each word using a dictionary.Dictionaries will usually put an apostrophe just before the stressed syllable or after it.

The phonetic spelling for each of the words are given below:

A. Mature - /məˈtʃʊə/

B. Nature - /ˈneɪtʃə/

C. Culture - /ˈkʌltʃə/

D. Measure - /ˈmɛʒə/

Notice that options B - D have the apostrophe in the same place - at the beginning of the entire syllables. Ma - ture, however, has its stress on Ma.Hence Option A - Mature is different from the rest.

See the link below for more about phonetic stress:

link