Lake Baikal is a huge lake in Siberia, Russia. It is the (21) _____fresh water reservoir in the world. The lake is near Irkutsk. Lake Baikal is about 636 kilometers long. It is 20 to 80 kilometers wide. (22) ______its deepest point, it is 1,700 meters deep. With this depth, it is the deepest lake on Earth. The lake is (23) ____UNESCO World Heritage Site. It holds about 20% of the world's unfrozen surface fresh (24) ____. The lake has fish that exist only here and nowhere else. It is home to more than 1,700 (25) _____of plants and animals, two-thirds of which can be found nowhere else in the world.

21. A. smallest B. biggest C. longest D. highest

22. A. At B. In C. On D. Of

23. A. a B. an C. the D.x

24. A. land B. ice C. water D. air

25. A. classes B. forms C. styles D. species

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