单项选择题

A．They both attract scientists’’ attention
B．They can both be quite challenging
C．They are both thought-provoking.
D．They may both lead to surprising findings.
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单项选择题
A．Young.B．Purcell.C．Raleigh.D．Kelly.
A．Young.
B．Purcell.
C．Raleigh.
D．Kelly.
单项选择题
When we are to remove a video cassette from a VTR, we should first turn on the VTR and then press the Eject Button.
A．Y
B．N
C．NG
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