30. Studies have shown that the polar ice caps are melting at a(n) _____ rate.
(A) universal
(B) inspiring
(C) unprecedented
(D) reliable
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統計: A(15), B(40), C(335), D(18), E(0) #1835492
統計: A(15), B(40), C(335), D(18), E(0) #1835492