井上、下应设置消防材料库，且每季度至少检查（）次。
A.4
B.3
C.2
D.1
参考答案：D
____ students get up at six and ____ get up at six thirty.
A．Some; other
B．Other; some
C．These; they
D．Some; others
需要采取灭菌措施的复用物品有哪些？
