【单选题】对互为因果关系的现象进行方程回归分析时( )
【单选题】--There so many foreigners in the streets these days. -- They might be runners in the Yellow River Estuary (入海口,河口) International Marathon.
【单选题】患者服用甲硫氧嘧啶治疗1个月后,出现高热、咽痛,应首先复查
【单选题】There are many foreigners in this group, four Italian tourists.