关于下图A、B两处地形部位描述正确的是
A．A为山谷、B为山脊
B．A为山脊、B为山谷
C．A为鞍部、B为陡崖
D．A为盆地、B为山脊
答案：C
. It was great joy ________ he received the news that his lost daughter had been found.
A．because
B．which
C．since
D．that
下列叙述中不正确的是______。
A．32位微机的字长为4个字节
B．内存容量32MB＝32×1000000B
C．计算机系统必须由硬件和软件两部分组成
D．计算机程序是各种指令的集合
