Which of the following attraction is important for trade of frankincense? （ ） A: Wadi Bani Khalid B: Salalah C: The Al Alam Palace D: Ras al-Jinz
Which of the following attraction is important for trade of frankincense? （ ） A: Wadi Bani Khalid B: Salalah C: The Al Alam Palace D: Ras al-Jinz
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