Các tỉnh nào sau đây ở vùng Trung du và miền núi Bắc Bộ không có đường biên giới trên đất liền với Trung Quốc?
Đáp án đúng là: B. Sơn La, Bắc Kạn.
Giải thích:
Sơn La và Bắc Kạn là hai tỉnh không có đường biên giới trên đất liền với Trung Quốc.
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