应在（）满足要求时，方可进行盘、柜安装。
A.电气条件
B.土建条件
C.环境条件
D.天气条件
参考答案：B
—"How long may I ______ the school library books?"
—"For two weeks. You must return it in two weeks."[ ]
A. borrow
B. lend
C. keep
D. read
