Lake Superior is the largest freshwater lake in the world,and the third largest in volume (体积),behind Lake Baikal in Rus

Lake Superior is the largest freshwater lake in the world,and the third largest in volume (体积),behind Lake Baikal in Russia and Lake Tanganyika in Africa.Lake Superior has a surface area of 31,700 square miles.It is 616 kilometres long from the east to the west and 257 kilometres wide from the south to the north.Its average depth is 147 metres and the greatest depth is about 406 metres.Lake Superior has about 12,100 km³ of water.There is enough water in it to cover the whole land of North and South America with about 1 foot (30 cm) of water.The shoreline (海岸线) of the lake is 4,387 km,including islands.
Storms on Lake Superior usually record wave heights of over 6 metres.Waves well over 9 metres have been recorded.The lake is fed by over 200 rivers.The largest include the Nipigon River,the St.Louis River,the Pigeon River,the Pic River,the White River,the Michipicoten River,the Bois Brule River and the Kaministiquia River.The largest island in Lake Superior is Isle Royale in the state of Michigan.Isle Royale has several lakes.There are also some islands in some of the lakes.
21题判断正误(“T”表示正确,“F”表示错误);22题完成句子;23题将文中划线句子译成汉语;24-25简略回答.
21.Lake Superior is the largest freshwater lake in the world.【 】
22.Lake Superior is 616 kilometres long from .
23.24.How many largest rivers does the writer write in the passage?
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25.What is the largest island in Lake Superior?
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