Water is the "life blood" of our earth. It is in every living thing. It is in the air. It runs through mountains and valleys (山谷). It forms lakes and oceans (海洋). Water is everywhere.Nature has a great water system (系统). Rain water finds its way to streams (溪流) and rivers. Rivers run to the oceans. At the mouths of the rivers, fresh water joins the salt water of the ocean.Here at the mouth of a river there is much important plant and animal life. Pollution destroys(破坏)this life, however, we have to clean our streams and rivers. Man has to work with nature—not against it.源:学+科+网]选择题(1) According to the reading, water is like ______. A. blood B. rain C. life D. food (2) Rivers bring _____ water to seas and oceans. A. clean B. spring (泉水) C. fresh D. salt (3) Which of the following statements is not true? _____. A. There is no water under the ground. B. Water forms lakes and oceans C. Nature has a great water system D. Rain water can find its way to streams and rivers (4) Water in rivers mainly comes from rain, and it usually has _____. A. all kinds of fishes B. stones in different sizes C. plenty of salt D. sand and soil (5) The word “against” means _____. A. 拥护 B. 改造 C. 保护 D. 反对