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构成粗肌丝的成分是
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食管的上皮为（）
胃最高的部分为（）
Listen to a short passage concerning global warming.[音频]Global warming may or may not be the great environmental 1of the 21st century, but—regardless of whether it is or isn’t—we won’t do much about it. We will argue over it and may even, as a nation, make some fairly solemn-sounding2 to avoid it. But the more dramatic and meaningful these commitments seem, the less likely they are to be3 .
[音频]Al Gore calls global warming an “
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