“洪水一片，枯水几条线”是对洞庭湖现状的真实写照，据此回答（1）——（2）题。
（1）造成洞庭湖萎缩的主要原因是
①泥沙淤积 ②蒸发加强 ③围湖造田 ④降水减少 [ ]
A、①②
B、③④
C、①③
D、②④
（2）治理洞庭湖萎缩的主要措施有
①长江中上游地区退耕还林，封山育林 ②洞庭湖区退耕还湖，平垸行洪
③洞庭湖区开挖湖泊，加大湖盆 ④长江干流修筑堤坝，加固大堤 [ ]
A、①②
B、②③
C、③④
D、①④
（1）C
（2）A
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| Mark Twain was one of America's greatest writers. He was born 1 November 30th,1835. 2 he was 4 years old, his parents moved the family to Hannibal, on the banks of the Mississippi River. Mark Twain 3 in Hannibal. The Mississippi gave him the material for many of his greatest 4 . He later took the name Mark Twain as a reminder(提醒) of life on the Mississippi when the boat workers charted (记录) the depth of the river, they would cry" Mark Twain ! " Young Mark Twain 5 school at the age of 11 to become a printer. He moved to San Francisco in 1864, joining The Morning Call and 6 for magazines. In 1865 a New York magazine published his short story. It made him 7 overnight(一夜间). In 1870, Twain married Olivia Langdon, then they 8 to Hartford. In Hartford, he wrote many books like Life on, the Mississippi. The books made him one of the best-known and the most famous 9 of his time. When not working, he enjoyed 10 time with his daughters. As young girls, Twain's daughters loved to act out his stories. | ||||
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