华为OSN系列设备提供四种业务级别：金级、银级、铜级、铁级。（）
参考答案：错
On his way to the top of the mountain, the boy dropped his stick, ______he______ it. [ ]
A. and; stopped getting
B. so; stopped getting
C. /; stopped to get
D. so; stopped to get
影剧院场次的间隔时间不应少于（）
A.40min
B.30min
C.20min
D.10min
E.5min
