阿摩線上測驗
6. More than one-third of the world's tree species are_________ with extinction, according to the world's leading scientific authority.
(A) defenseless
(B) exposed
(C) uncovered
(D) threatened
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統計： A(0), B(0), C(0), D(5), E(0) #3757225
統計： A(0), B(0), C(0), D(5), E(0) #3757225
