单项选择题

NASA is making research on various kinds of space habitats because ______.

A．people on the earth must all move to the moon
B．many space industries will need workers to work out in space
C．new markets and more jobs will be created by space industrialization
D．space research has reached a new level

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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.

单项选择题

Which of the following statements CANNOT reflect the fragmentation of English

A．Non-native speakers are preferred to teach English in non-English-speaking countries.
B．Many countries prefer to teach their mother tongues instead of English.
C．The version of English taught by non-native teachers contains some features of their own language.
D．Many more local English publications will appear.