单项选择题

A．Every ten minutes.
B．At twenty to one.
C．Every half-hour.
D．Once a day.
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单项选择题
A．To overcome the problem of weak light.B．To take more photographs.C．To photograph astronomical objects without using a telescope.D．To spend less time at their telescopes.
A．To overcome the problem of weak light.
B．To take more photographs.
C．To photograph astronomical objects without using a telescope.
D．To spend less time at their telescopes.
单项选择题
A．He is not to blame.B．It was his fault.C．He will accept all responsibility.D．He will be more carefully next time.
A．He is not to blame.
B．It was his fault.
C．He will accept all responsibility.
D．He will be more carefully next time.
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