摘要：构词法(动词-名词复数7.介词 8.构词法9.并列连词10.过去分词被动 语法填空(九) In the sea, at the base of what scientists call the food web, 1 single-celled plants. 2 plants – algae– provide the energy for the web that feeds higher forms of life. 3 some conditions, algae suddenly begin to spread very quickly, an event 4 as a bloom. When algae bloom, they can change the color of the water as they form dense areas near the surface. You may 5 the term “red tide . But experts say this is 6 . Blooms are not connected with tides, and 7 do not always appear red – the water can look brown 8 greenish. So, instead of “red tide , scientists use the term “harmful algal bloom , or HAB 9 short. Not only the fish that feed on algae are dangerous to eat, bigger fish that eat the algae-eaters may also be 10 . Keys:1. are 2. These 3. Under4. known 5.have heard 6. incorrect 7. they 8. or 9. for 10. also 考点:1.倒装句 2.指示代词 3.介词 4.非谓语动词

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