单项选择题
Passage Two
A. They don’t need conventional signs and symbols. B. They only require a receiver in communication. C. The distance between communicators can’t be too long. D. They are not restricted in time and space.
A. The adoption of modern ideologies can stop war. B. The adoption of any ideology could prevent war. C. The adoption of some ideologies could prevent war. D. The adoption of any ideology can’t stop war.
A. It will confine us to the four walls. B. We will have unlimited freedom. C. The rich will be even richer. D. Education will be widely spread.