问题
选择题
As is known to us all, the Sahara Desert is a natural _____ between north and central Africa. [ ]
A. barrier
B. routine
C. garment
D. basis
答案
答案：A
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As is known to us all, the Sahara Desert is a natural _____ between north and central Africa. [ ]
A. barrier
B. routine
C. garment
D. basis
答案：A