Essential Part - Verbal and Reasoning

Directions to SolveA good way to approach this type of question is to use the following sentence: "A ______ could not exist without ______.". Find the word that names a necessary part of the underlined word.
Q1:

town

A residents

B skyscrapers

C parks

D libraries

ANS:A - residents

Explanation: Residents must be present in order to have a town. A town may be too small to have skyscrapers (choice b). A town may or may not have parks (choice c) and libraries (choice d), so they are not the essential elements.