語法填空

　　In the sea, at the base of what scientists call the food web, 　　1　　 single-celled plants．　　2　　 plants–algae(海藻)–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　　(know)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　　(hear)the term“red tide”．But experts say this is 　　6　　(correct)．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　　(danger)．

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解析：

1．a(chǎn)re　2．These　3．Under　4．known　5．have heard　6．incorrect　7．they　8．or　9．for　10．a(chǎn)lso


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1、倒裝句　2、指示代詞　3、介詞(短語)　4、非謂語動詞(過去分詞)　5、完成時　6、構(gòu)詞法(反義詞)　7、代詞　8、并列連詞　9、介詞　10、名詞－形容詞。


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