题目
第1题
A.for
B.about
C.at
D.on
第2题
第3题
第6题
第7题
第8题
第9题
Why do you think they had not a backup computer?
A. Because it was easy down.
B. Because it was very expensive.
C. Because it was not advanced enough.
D. Because it was not as big as the main computer.
第10题
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