单项选择题


A．afore
B．prior
C．previous
D．preceding
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单项选择题
The difference between the two versions of the timeline by NASA is
A．30 seconds.
B．5 minutes and 30 seconds.
C．7 minutes and 30 seconds.
D．3 minutes and 30 seconds.
单项选择题
According to the news, the American space shuttle Columbia failed
A．on Jan. 3rd.
B．on Feb. 1st.
C．on Mar. 4th.
D．on Jan. 2n
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