6. 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(66), B(65), C(603), D(40), E(0) #655503
統計: A(66), B(65), C(603), D(40), E(0) #655503