单项选择题


Questions 33 to 35 are based on the passage you have just heard.

A．The police.
B．A bee-keeper.
C．A beeper.
D．The poor motorist.
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Why can astronomers age galaxies by computing how much the wavelength of their light has stretched
单项选择题
A．Building relationship with outer space.B．Making profits.C．Creating a stepping-stone to scientific research.D．Fostering international scientific cooperation.
A．Building relationship with outer space.
B．Making profits.
C．Creating a stepping-stone to scientific research.
D．Fostering international scientific cooperation.
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