阿摩線上測驗
20. Whitehorse, the capital city of Yukon in Canada, has been verified as having the cleanest air with the least amount of_______ particles in the world by the Guiness book of records.
(A) poisonous
(C) crushing
(B) dreadful
(D) disastrous
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統計： A(1), B(0), C(0), D(0), E(0) #3364817
統計： A(1), B(0), C(0), D(0), E(0) #3364817
