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  3. What is the benefit of using two stranded barbed wire? According to the author, the steel wires used to make barbed wire are sp

What is the benefit of using two stranded barbed wire? According to the author, the steel wires used to make barbed wire are sp

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问题 What is the benefit of using two stranded barbed wire?
According to the author, the steel wires used to make barbed wire are specially processed to ______.
选项 A、make them more flexible
B、protect them against rust
C、straighten them
D、prevent contraction in cold weather
答案B
解析 本题为细节辨认题。第三段第四句讲到“The steel wires used are galvanized — coated with zinc(锌)to make them rustproof”，也就是说，用来制铁丝网的钢丝经过镀锌后以防生锈。
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