题目内容

1988年，中国起爆第一颗氢弹。()

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__________makes it possible for language users to overcome the limitations of time and space in communication.

Arbitrariness
B. Duality
C. Productivity
Displacement

战略环境是制定战略的客观依据，正确认识和分析战略环境，是正确、及时地制定和调整战略的前提条件。()

信息战是敌我双方围绕对信息的感知能力、传输能力、处理能力和决断能力进行的对抗活动。()

When the train __________ ， all the school students were surprised to see that the Carlisle team had one man only.

A. pulled down
B. pulled on
C. pulled off
D. pulled in