Population growth rates vary among regions and even among countries within the same region

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Mark the letter A, B, C or D on your answer sheet to indicate the word or phrase that is OPPOSITE in meaning to the underlined part in each of the following questions

Population growth rates vary among regions and even among countries within the same region.

restrain

fluctuate

remain unstable

stayed unchanged

Giải thích

Đáp án là D.

“vary”: thay đổi, biến đổi
Trái nghĩa là stayed unchanged: giữ nguyên, không đổi gì