已知甲任意—次射击中靶的概率为0.5，甲连续射击3次，中靶两次的概率为（）。
A．0.375
B．0.75
C．0.325
D．0.125
参考答案：A
—I think the whole class is going on a field trip next Friday.
—I’m not sure. ____________ has paid the transportation fee.
A．Not everyone
B．No one
C．None of them
D．Neither of us
简述克里斯提尼改革。
