Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.    

An elephant's brain is ________ than a whale's brain.

• A. A. more big
• B. B. bigger
• C. C. the bigger
• D. D. the biggest

"Có than => so sánh hơn
Big có 1 âm tiết => thêm đuôi -er"