14. The threat of recent natural disasters is a reminder that despite our technological advances, men are still extremely vulnerable to the power of Mother Nature.
(A) secure
(B) strong
(C) unprotected
(D) durable
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統計: A(2), B(13), C(159), D(19), E(0) #923137
統計: A(2), B(13), C(159), D(19), E(0) #923137