单选题 Which word best describes the attitude of the author?

【正确答案】 D
【答案解析】[解析] 作者态度题。根据全文的中心思想,尤其是In short,they will flourish because they enable us to accomplish tasks that could never before have been undertaken,no matter how many unskilled laborers we might have set to work。“简而言之,它们将会发展,因为它们使我们能够完成许多从前根本无法完成的工作,无论我们曾经用了多少技术不熟练的工人”可推断出作者的态度是[D] “建设性的”;而不是[A] “好问的”, [B]“技术上的”,或[C]“悲观的”。