________ is known to us all that the world weather is getting warmer and warmer.

 

It　

【解析】that the world weather is getting warmer and warmer是真正的主語(yǔ)，it是形式主語(yǔ)。

 

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Tail Spin

Two dolphins race around in a big pool in the Ocean Park. The smaller dolphin, Grace, shows off a few of her tricks, turning around and waving hello to the crowd. The most amazing thing about her, however, is that she's even swimming at all. She doesn't have a tail.

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