单项选择题

A．The natural colors of astronomical objects can be captured.
B．The cost of equipment needed is reduced.
C．Fewer data need to be analyzed.
D．The images can be studied by different astronomers.
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单项选择题
A．It went out of use 300 years ago.B．It was invented after the short bow.C．It was discovered before fire and the wheel.D．It’s still in use today.
A．It went out of use 300 years ago.
B．It was invented after the short bow.
C．It was discovered before fire and the wheel.
D．It’s still in use today.
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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