单选题 Based on the information in paragraph 4, which of the following was probably true about copper in the colonies?

A、 The copper used by colonists was not effective in conducting heat.
B、 The copper items created by colonial coppersmiths were not skillfully made.
C、 There were no local copper mines from which copper could be obtained.
D、 The price of copper suddenly decreased.

【正确答案】 C

【答案解析】[试题分析] 本题测试学生对关键句理解的能力。
[详细解答] 只要找出最后一段的关键一句话，这道题就迎刃而解了。“Virtually all copper worked by smiths was imported as sheets or obtained by recycling old copper goods．”这句话告诉我们，在当地没有铜矿资源，因此，选C。