The earth is the only planet with a large number of oxygen in its atmosphere.
A. the
B. number
C. oxygen
D. its
Đáp án B sửa thành “amount”
Giải thích: The amount of + danh từ không đếm được. The number of + danh từ đếm được
Trong câu hỏi này, danh từ đằng sau là “oxygen” không đếm được nên ta dùng “amount”.
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