9. If the polar ice _______, the sea would rise and some low-lying areas might be flooded.
(A) booked
(B) curled
(C) melted
(D) turned
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統計: A(17), B(26), C(411), D(25), E(0) #2795796
統計: A(17), B(26), C(411), D(25), E(0) #2795796