单选题：Many researchers believe the oxygen level was high during pr

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题目内容：
Many researchers believe the oxygen level was high during pre-animal times. A．Right
B．Wrong
C．Not mentioned

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Three world-class tennis players came to contend for this title.A．argue B．claim

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A person's wealth is often in inverse proportion to their ha

A person's wealth is often in inverse proportion to their happiness.A．equal B．ce

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The rules are too rigid to allow for human error.

The rules are too rigid to allow for human error.A．general B．complex C．inflexibl

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回答(13)题A．accident B．harm C．experience D．model

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回答(4)题A．some B．few C．much D．little

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