人人都应遵守“红灯停、绿灯行”的交通规则．红绿灯在人体形成视觉的部位是（ ）
A．晶状体
B．视网膜
C．视神经
D．视觉中枢
答案：D
It's so nice to receive her letter. _______, we haven't seen each other for nearly 20 years. [ ]
A. That's to say
B. In other words
C. Believe it or not
D. What's more
下列哪些接口不是MAP接口（）。
A、C
B、D
C、B
D、E
