单项选择题

A．Classroom rules.
B．Ways of painting.
C．Cooking measures.
D．House rules.
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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．Every ten minutes.B．At twenty to one.C．Every half-hour.D．Once a day.
A．Every ten minutes.
B．At twenty to one.
C．Every half-hour.
D．Once a day.
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