100 câu trắc nghiệm Từ trái nghĩa cơ bản (P4)
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At times, this can be risky, and the keepers have been injured and one has been killed

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At times, this can be risky, and the keepers have been injured and one has been killed.

good

useful

healthy

secure

Giải thích

Đáp án D

risky: mạo hiểm >< secure: an toàn