低出口,高债务振荡中、东欧 (2)
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背诵美文——灯塔
LighthousesThe first navigational lights in the New World were probably lanterns hung at harbor entrances. The first lighthouse was put up by the Massachusetts Bay Colony in 1716 on...
污染干扰老年人思维
环境污染有害健康People who live in polluted cities can see the grit and dirt produced from vehicle engines but some of the most damaging emissions are only now starting to be understood. They’re...
美科学家发现猛犸象化石 (2)
Harris; ZedHarris is chief curator at the Page Museum, which houses treasures from the tar pits. He says only partial remains of mammoths were found at this site before, and Zed is thelargest eve...
学校全年开放?(2)
学校是否应该全年开放?其中自然有利有弊Some parts of the country had year-round programs in the 19th century, mostly for economic reasons. They felt it wasted money to use school buildings for onl...