Population growth rates vary among regions and even among countries within the same region.
A. restrain
B. stay unchanged
C. remain unstable
D. fluctuate
Đáp án B
vary = làm cho biến đổi
A. restrain: kiềm chế
B. stay unchanged: không thay đổi
C. remain unstable: vẫn không ổn định
D. fluctuate: biến động
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