单项选择题

This passage is most probably taken from ______.

A．an article of popular science
B．the introduction of a book of astronomy
C．a lecture given by the author to astronomy students
D．the preface of a piece of science fiction

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单项选择题

From the passage we know that welfare reform aims at ______.

A．saving welfare funds
B．rebuilding the work ethic
C．providing more jobs
D．cutting government expenses

单项选择题

The book gives a brief ______ of the course of his research up till now.

A．outline
B．reference
C．frame
D．outlook