39.In the second paragraph, what does the word “they” refer to?
(A)Devices.
(B) Parents.
(C)Cycles and lights.
(D)Children and teens.

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統計： A(15), B(17), C(27), D(98), E(0) #2042772

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#3507550
teens 十幾歲（指十三至十九歲）；十...
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