填空题

【参考答案】

costly
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填空题
The passage was probably written in _________________________.
单项选择题
A．Equivalent to a hydrogen bomb.B．Equivalent to tons of TNT.C．Equivalent to tons of hydrogen bombs.D．Equivalent to a ton of TNT.
A．Equivalent to a hydrogen bomb.
B．Equivalent to tons of TNT.
C．Equivalent to tons of hydrogen bombs.
D．Equivalent to a ton of TNT.
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