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【单选题】
在火灾初发阶段,应采取哪种方法撤离A.
乘坐电梯
B.
用湿毛巾捂住口鼻低姿态从安全通道撤离
C.
跳楼逃生
D.
跑到楼顶呼吸
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【单选题】The local government has been providing _______ support to them, without which they couldn ’ t have been so successful.
A.
controversial
B.
essential
C.
substantial
D.
potential
【简答题】听短文，判断正误，正确的写T，错误的写F。 ( )1. David and Jack are neighbours. ( )2. They have been friends for a long time. ( )3. Jack is a primary school student. ( )4. David wants to be a popular playe...
【单选题】— Where are the twins? — I think they _____ Hangzhou. They _____ there twice before. [ ]
A.
have been to; has gone to
B.
have gone to; have been
C.
have been to; have been to
D.
have gone to; have gone
【多选题】下列关于 IP 协议的描述正确的有 ()
A.
IP 协议只对 IP 报首进行校验和检查。
B.
IP 协议对 IP 报首和数据都进行校验和检查。
C.
IP 协议是高效，尽力交付的协议。
D.
IP 协议是可靠的协议。
【单选题】They have never been to Beijing, -?
A.
have they
B.
isn't they
C.
haven,t they
D.
aren,t they
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