(2024) Đề minh họa tham khảo BGD môn Tiếng Anh có đáp án (Đề 20)

The word “it” in paragraph 2 refers to ______. A. action B. caffeine C. reason D. brain

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The word “it” in paragraph 2 refers to ______.

action

caffeine

reason

brain

Giải thích

Giải thích: B

Từ “it” thay thế cho từ “caffeine”.

The reason that caffeine makes you feel alert and less sleepy is because it blocks the action of adenosine, the brain chemical which controls your sleep patterns, and increases adrenaline production, speeds your metabolism.