阿摩線上測驗
16. What is this article mainly about?
(A)A useful tool and how to use it.
(B) A fatal illness and how to stop it.
(C)A bad habit and how to break it.
(D) A technical skill and how to acquire it.
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統計： A(25), B(41), C(455), D(43), E(0) #935461
統計： A(25), B(41), C(455), D(43), E(0) #935461
