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【单选题】

Based on their internships, the two students are interested in_____.

A.
historical preservation
B.
geology
C.
jordan
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举一反三

【单选题】The Great Wall needs to be scrubbed to_____.

A.
clean off the graffiti
B.
prevent erosion
C.
make it shine for visitors

【单选题】Both Petra and the Great Wall of Chine are______.

A.
red stone structures
B.
United Nations World Heritage Sites
C.
cities