关于IgE,下列哪项是错误的()
A. IgE在五类Ig中含量最低
B. IgE有CH4区
C. IgE可介导I型超敏反应
D. IgE有亲细胞性
E. IgE在种系发育过程中最早发生
5000多年前,中国人把贝壳当作钱来使用。随着冶金技术的发达,金属货币开始在中国流通。Chinese ____ money, qian, 5,000 years ago.______ metallurgy, ____ started to ____.
这些铜铸钱,来源于中国人民的生产生活。出现了由农具演变的布币,由渔具和刀演化而来的刀币等。These copper coins_____ Chinese people’s daily _____. Spade-shaped coins came from farming tools and ____ came from fishing gear and knives.
而在中国古代流通时间最长的是以帝王年号未标志的通宝钱。黄金、白银、粮食、纺织品都曾在中国古代作为钱使用。The Tong Bao coin symbolizing the titles of emperor’s reigns were ______ in the history of China. Gold, ____, food and ____ were once used as qian in China.