---Little Tom got an “A” in the exam.

--- ___ he’s been so happy these days.

A．No wonder that

B．I wonder why

C．It is a wonder that

D．Because

项目环境影响综合评估的方法有（）

A.指数法

B.矩阵法

C.图形叠置法

D.网络法

E.模拟法