①C，CO②AlCl₃、Al（OH）₃③Fe、Fe（NO₃）₂④Na₂CO₃、NaHCO₃．

（参考数据：若随机变量ξ服从正态分布N（μ，σ²），则P（μ﹣σ＜ξ＜μ+σ）=68.26%，P（μ﹣2σ＜ξ＜μ+2σ）=95.44%，P（μ﹣3σ＜ξ＜μ+3σ）=99.74%．）

他以治水造福于民而名扬天下，又以创建中国历史上第一个奴隶制王朝而名垂青史．“他”是（　　）

    Are you ready for adventure (冒险)? Then Sunny Shores Sea Camp is the place for you! The activities there are all about the sea.
At Sunny Shores Sea Camp, you can get excited and improve your skill-level. You can enjoy the wonders of Sunny Island. From diving（潜水）to sailing, sea science to seafood, Sunny Shores Sea Camp offers courses for your different interest. You can also learn about the sea environments of Sunny Island. It is hard for you to find anywhere else like that.
    Whether you're a beginner or already an expert (专家), Sunny Shores Sea Camp is a great place that brings together campers from all over the world.
    Wonderful memories and new friends are waiting for you at Sunny Shores Sea Camp!
Camp Activities: Adventure . Sea Biology. Diving . Sailing . Windsurfing
Camp Address: Sun Bay , South Florida 000634
Dates: June 28 - July 18 , July 21 -August 9
Cost Week: $600 - $900
Campers Ages: From 13 to 17
Contact us: Sign up at www.sunnyshoresseacamp.org! Or call 800-645-14231