张大爷将收集的尿液经处理后，浇在了菠菜地里，菜苗长势喜人。这主要是因为尿液的成分中含有[ ]
A．尿素
B．水
C．蛋白质
D．葡萄糖
答案：A
The lead singer was ill and couldn't sing that night, and her ________ didn't perform well, which made the audience disappointed.[ ]
A．agent
B．attitude
C．substitute
D．institute
似蚓蛔线虫的感染阶段是
A．感染期蛔虫卵
B．未受精蛔虫卵
C．受精蛔虫卵
D．脱蛋白膜蛔虫卵
E．新鲜蛔虫卵
