题目

任务型阅读；根据短文内容回答问题，并将答案写在相应位置。    In most countries, people usually eat traditional food on special holidays. A special day in the United States is Thanksgiving. It is always on the fourth Thursday in November, and is a time to give thanks for food in the autumn. At this time, people also remember the first travelers from England who came to live in America about 400 years ago. These travelers had a long, hard winter, and many of them died. In the next autumn, they gave thanks for life and food in their new home. These days, most Am“加碘食盐”、“高钙牛奶”、“含氟牙膏”，其中的碘、钙、氟是指 A．原子B．分子C．离子D．元素