单项选择题

A．Less than one year.
B．Four years.
C．Five years.
D．Ten years.
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单项选择题
A．To watch the night scenes.B．To look up at the stars.C．To clean up the roof.D．To show their visitor the view.
A．To watch the night scenes.
B．To look up at the stars.
C．To clean up the roof.
D．To show their visitor the view.
单项选择题
A．Artificial hearts.B．Telescopes.C．Microscopes.D．Radio telescopes.
A．Artificial hearts.
B．Telescopes.
C．Microscopes.
D．Radio telescopes.
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