50. For people who are always busy, what should they learn?
(A)Scrolling through their phone is a waste of time.
(B)Sitting quietly in a park is good for them.
(C)Rest may cause stress and anxiety.
(D)Working hard can make them wealthy and healthy
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統計: A(0), B(20), C(1), D(0), E(0) #3676329
統計: A(0), B(20), C(1), D(0), E(0) #3676329