Every student as well as teachers who ______ to visit the museum ______ asked to be at the school gate on time.

A．is; is

B．are; are

C．is; are

D．are; is

贷款未来收益（损失）的概率分布符合正态分布假设，可直接利用均值——方差模型度量其信用风险。（）