单项选择题

The first ______ of the bridge is one hundred meters long.

[A] preface
[B] span
[C] block
[D] phase

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单项选择题

Since 1945, the rivalry in military strength between the world's great powers has produced a ______ balanced peace.

[A] contemporarily
[B] predictably
[C] temporarily
[D] previously

单项选择题

______ a sudden explosion, there is a real probability that these kids could be injured.

[A] Being there
[B] Should there be
[C] There was
[D] There have been

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