题目

饮食结构不合理又可能引起维生素缺乏症。如果某成年人的体内长期缺乏维生素A和维生素D，那么此人就会患（  ） A．角膜炎，坏血病           B．脚气病，坏血病 C．夜盲症，骨质疏松症       D．夜盲症，角膜炎 答案：CAlgae(水藻) are very simple plants. They grow in fresh water or salty water. Seaweed is algae that grow in salty water. Seaweed is red or brown in color. The Japanese people use these plants from the sea in many ways. From it, they make a food called Kombu. Kombu is seaweed that has been dried, cooked and pressed together. Then it is dried again and cut into long pieces. The Japanese eat a lot of Kombu and like it very much. Japanese farmers often use seaweed as fertilizer. It makes their plants grow better. Many farmers also find seaweed makes a fine food for their animals. From seaweed the Japanese also get iodine(碘), which they sell to other countries. Iodine is used in many ways all over the world. It is used in making medicine. It is added to the salt we use at the table. Scientists even use one form of iodine to “ seed clouds” when they want rain to fall.小题1: Kombu is a kind of ____ according to the text.A．plantB．medicineC．foodD．fertilizer小题2:In the last sentence of the text, “seed clouds” means ____.A．clouds spreading like seedsB．the seeds like cloudsC．to make rain fall with human powerD．dropping seeds by clouds小题3:The main idea of the story is that ____.A．The Japanese eat seaweed when they want rain to fall.B．Kombu is made into medicine for farmers.C．The Japanese use seaweed in many ways.D．The Japanese eat a lot of Kombu.