题目内容

[A] absolute
[B] arbitrary
[ C] plentiful
[D] superfluous

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What enabled the earliest balloons to fly？
[A] Gas produced by metal and coal. .
[B] Air kept hot by burning coal.
[C] Hydrogen heated by a. gas burner.
[D] Natural gas carried in a metal container.

What does Beth Orton want to do in the next year or so？
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[ A] theorize
[ B] originate
[ C] invent
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心理学家皮亚杰把人的认知发展分为四个阶段，其中具体运算阶段指（）。