问题
单项选择题 B型题
巨幼红细胞性贫血是缺乏（）
A.维生素C
B.维生素B12、叶酸
C.烟酰胺
D.维生素A
E.凝血因子
F.硫酸亚铁
答案
参考答案：B
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巨幼红细胞性贫血是缺乏（）
A.维生素C
B.维生素B12、叶酸
C.烟酰胺
D.维生素A
E.凝血因子
F.硫酸亚铁
参考答案：B
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| In 1820, it was difficult to make weather maps. Why was it so difficult? It was not easy then to get weather reports 1 . The scientists needed the reports to make the maps. Today it is not difficult to get weather reports quickly from everywhere. Today the whole world 2 together to make weather maps. Weathermen send reports from country to country in 3 . There are weather offices in many, many 4 . There are also weather ships, weather balloons, and satellites to help the weathermen. They study the 5 24 hours a day, seven days a week. All their reports will be on maps in New York, London, Tokyo, Mexico City, and many other places. Weather is international. That is, it had its own special language 6 people in all countries can 7 it. The weathermen draw 8 in the same figures and numbers in all countries. A weather map from the United States and Canada looks 9 as a map from Turkey, Russia, or Sweden. Sometimes we plan what we 10 the next day. We want to 11 what we can do or can't do. We watch 12 to find out the weather for 13 . We can listen to the radio or read the newspaper for 14 about the weather. People all over the world can make the same weather maps. They can know about the 15 . They can plan their days, too. | ||||
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