题目

Skeptics are a strange lot. Some of them refuse to admit the serious threat of human activities to the environment, and they are tired of people who disagree with them. Those people, say skeptics, spread nothing but bad news about the environment. The “eco-guilt” brought on by the discouraging news about our planet gives rise to the popularity of skeptics as people search for more comforting worldviews.Perhaps that explain why a new book by Bjorn Lomborg received so much publicity. That book, The Skeptical Environmentalist, declares that it measures the “real state of the world” as fin小莉的妈妈一直注意给她加喂钙粉，可医生还是诊断小莉缺钙，原因是在服用钙粉时没有补充（　　） 　    A． 维生素A B．  维生素B C． 维生素C D． 维生素D