Read the following passage and mark...

Câu hỏi: Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 1 to 5.

A. Some scientists have challenged a theory. 

B. Some small teeth have been discovered. 

C. Some mammoths lived longer than others. 

D. Some pachyderms survived on an island.

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