美国科学家利用哈勃太空望远镜观测、收集的数据，发现并证实了暗能量的强度以及它对宇宙膨胀的加速作用，并进一步测算出宇宙的实际年龄为137．5亿年。人类在科学解释宇宙大爆炸，揭示生命、宇宙、万物形成的奥秘的道路上又向前迈进了一步。这说明 [ ]
①认识来源于大胆假设
②实践的发展推动人类认识的发展
③真理来源于科学实验
④追求真理是一个永无止境的过程
A．①③
B．①④
C．②③
D．②④
答案：D
In China, water is used in many different ways. Farming takes 60 percent of China’s water use. Personal use, like drinking water, takes only 12 pencent. Fifty- three countries and regions (地方) in the world have water shortages. About one fifth of the world’s population was suffer(遭受) from water shortage. Tips for saving water Saving water is as easy as turning off a tap! Here are some simple things you can do at home. ² Turn off the water while you’re brushing your teeth. ² Take shorter showers. Can you get your showers down to three minutes? ² Fill a liter (升) plastic bottle with water and put it in your toilet tank. It will take up the same space as the water usually does, but in a year, it will keep 20,000 liters of water. ² When you wash dishes and clothes, don’t let the water run. ² Use the washing machine only when it’s full of clothes. ² 根据短文内容，填写下面表格。
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