单项选择题

The possible barrier to the internationalization of Chinese in the future is ______.

A．the separation of its writing and pronunciation
B．the slow increase of its population
C．the popularity of Spanish
D．the rapid spread of the web language

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单项选择题

What will social scientists do in the years ahead

A．Warn people of the danger to live in space.
B．Offer opportunities for development to other scientists.
C．Discuss the relationship between space and man.
D．Study systematically the changes that space colonization may bring.