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【单选题】
帧中继采用的是面向连接的通信方式,将X . 25协议进一步简化为( )层模型A.
4
B.
3
C.
2
D.
1
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举一反三
【单选题】What can be inferred from paragraph 1 about cognitive development during the five-seven shift?
A.
It is a time when children start learning in very simple ways．
B.
It is the most important period in the child's formal education．
C.
It is a topic of disagreement among child psychologists．
D.
It is related to biological developments in the child's brain．
【单选题】During the last three decades, the number of people participating in physical fitness programs___ sharply.
A.
was increasing
B.
has increased
C.
had increased
D.
will be increasing
【单选题】下列哪一项不属于我国安全环境面临的问题( ) 。
A.
中国是一个陆地大国，所以关于海洋方面不存在和其他国家的争端
B.
边界和海洋权益争端尚存
C.
祖国统一面临复杂形势
D.
边疆分裂势力严重影响我国安全
【单选题】During the conversation, the man seems to be more interested in______.
A.
the size of the show
B.
the cost of the stand
C.
the basic furniture
D.
the visitor number
【单选题】During his flights, John H. Glenn, Jr. , could always reach a ______
A.
tracking station
B.
ship at sea
C.
Mercury capsule
D.
city of Perth
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