题目内容
（请给出正确答案）
A、unshielded twisted pair
B、shielded twisted pair
C、coaxial cable
D、optical fibers
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？Choose the best word to fill each gap.
？For each question (19-33), mark one letter (A, B, C or D) on your Answer Sheet.
？One answer has been given as an example.
Dear Mr. Jackson,
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【M1】
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