从子宫侧缘到盆腔的翼状双层腹膜反折将盆腔分成前后两个间隙，这一结构是()
A．输卵管
B．圆韧带
C．阔韧带
D．髂腰肌
E．主韧带
参考答案：C
找出下列句子中唯一的错误，并改正在后面的横线上。
1. I love my parent very much. They love me, too. _____________________
2. What are they? It's balls. _____________________
3. Five and three are eight. _____________________
4. this is my pencil-case. _____________________
5. This is my brother. Her name is Tom. _____________________
下列物质中，不能做氧化剂的是( )。
A．SO2
B．S
C．H2O
D．Cu
