【題目】

To our knowledge, light travels faster than sound.

__________ __________ __________ __________ __________, light travels faster than sound.

【答案】見解析

【解析】As far as we know

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【題目】Fencing or Not

Wildlife fences are constructed for a variety of reasons including to prevent the spread of diseases, to protect wildlife from poachers(偷獵者), and to help manage small populations of threatened species. Human-wildlife conflict is another common reason for building fences. Wildlife can damage valuable farm animals and crops. Some species carry diseases of agricultural concern, and a few threaten human lives. At the same time, people kill wild animals for food, trade, or to defend lives or property, and human activities destroy wildlife habitat(棲息地). Separating people and wildlife by fencing can appear to be a mutually beneficial way to avoid such harmful effects. But in a paper in the journal Science, published recently, some scientists argue that fencing should only be used if worse comes to worst.

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