在正常配置的3个基本视图中，长对正是（）两个视图。
A.主、左
B.主、俯
C.主、右
D.俯、左
参考答案：B
As is known to most of us, Maodun was born in _______is now called Wuzhen.
A．what
B．that
C．which
D．where
在原子中，带负电的粒子是
A．中子
B．电子
C．质子
D．核子
