单项选择题

A．They are accurate and easy to pull.
B．Their shooting range is 40 yards.
C．They are usually used indoors.
D．They took 100 years to develop.
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单项选择题
A．Classroom rules.B．Ways of painting.C．Cooking measures.D．House rules.
A．Classroom rules.
B．Ways of painting.
C．Cooking measures.
D．House rules.
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.
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