( ) is a major port of Morocco. A: Chongjin B: Casablanca C: Dover D: Durres

（）is a major port of Holland． A: Amsterdam B: Bali C: Durban D: Durres

( ) is a major port of Holland. A: Amsterdam B: Bali C: Durball D: Durres

( ) is a major port of Holland. A: Amsterdam B: Bali C: Durban D: Durres