下列化学符号正确的是[ ]
A．一个一氧化碳分子：CO
B．三个亚铁离子：3Fe3+
C．两个氮原子：2N
D．四个氢原子：2H2
答案：C
耻骨弓角度反映（）
A.骨盆入口平面前后径大小
B.中骨盆平面的大小
C.坐骨切迹宽度
D.出口横径大小
E.出口前后径大小
看看你的应变能力，用所给单词的适当形式填空。
1.Most children enjoy ___(see) the movie.
2.Look!A woman in red ______(walk) along the road.
3.It's twelve o'clock.The White _______(have) lunch.
4.You should turn left at the______(three) crossing.
5.They ______(watch) the football match tomorrow.
