阅读下面这首古诗，完成后面小题。
                                                                                                         冷香菊
                                                                                                         陈荣卿
                                                                                       晚秋风紧晓霜寒，香阵飘飘透竹帘。
                                                                                       荒径幽林甘冷落，肯于人世学趋炎？

下列元素中属于人体生命活动必需微量元素的是（　　）

阅读理解

A

    We all know that Taiwan is considered as the Treasure Island of China. It is very beautiful. Recently we have been closely connected. Several months ago, a group of 19 Taiwanese children flew to Chengdu in order to begin a tour to study pandas. The middle school children were from Chiayi County in southwest Taiwan and were chosen because of their excellent performances at school. During the visit, the children saw pandas up close. They were very excited to see so many pandas at the same time. The children also traveled to the Mount E'mei scenic area and met local school children. At last, they said, “The pandas are very cute, and we are all happy.” They also said the children in Chengdu were very friendly to them, and they all liked there. They hoped to visit Sichuan again.