单项选择题
听力原文: Goats always seem to be second best to o...听力原文: ...
未知题型听力原文: Goats always seem to be second best to o...
产业系统与生态系统完全相同,所以两者可以进行类比分析( ) The industrial system and...
判断题产业系统与生态系统完全相同,所以两者可以进行类比分析( ) The industrial system and the ecosystem are exactly the same, thus we can make an analogy between the two systems( )
iPhone4支持视频通话。()
未知题型iPhone4支持视频通话。()