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1. A rat's sharp teeth can gnaw through wood, plaster, or soft metallic such as lead.(1)____
译文：老鼠锋利的牙齿能够啃穿木头、塑料或者像铅一样的软金属。
2. Brooklyn New York, had a population of about 23,000 when it becomes a city in l834．(2)____
译文：1834年纽约的布鲁克林成为一座城市，那时它拥有2.3万人口。
3. Ensuring an adequate water supply have been a concern ever since people began to live in towns and cities.(3)____
译文：自从人们开始居住在城填和都市以来，保障足够的水供给一直是个引人关注的问题。
4. Data received from two spacecraft indicate that there is many evidence that huge thunderstorms are now occurring around the equator of the planet Saturn.(4)____
译文：从两艘宇宙飞船接收到的数据表明：已有大量的证据证明巨大的雷雨正出现在土星的赤道附近。
adj. 足够的，适当的，能胜任的
