单项选择题
All languages have two levels of usage: a _____ level and an informal level.( ) A. community B. component C. barrier D. formal
单项选择题 The animal leopard is one of the Chinese Zodiac Animals. A. 对 B. 错
单项选择题 高渗性脱水的病人会出现口渴和尿量减少。
单项选择题 西周时期将偶然犯罪称为() A、眚 B、非眚 C、惟终 D、非终