2012年11月20 SAT官方每日一题

Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.

While a “rock” is usually defined as________, or a combination, of one or more minerals, geologists often________the definition to include such materials as clay, loose sand, and certain limestones.

A. a conglomeration . . limit

B. an aggregate . . extend

C. an element . . eliminate

D. a blend . . restrict

E. a product . . provide