题目

—   How often do you eat out?    — ______, but usually once a week.    A. Have no idea       B. It depends       C. As usual        D. Generally speaking 答案：B 解析: 略核电站的核心设备是（　　）?A．热交换器?B．汽轮发电机?C．核反应堆?D．冷凝器?