简述用微细管水滴分离法分离微藻的操作要领和注意事项。
参考答案：
①容器、工具等的消毒准备工作。
②将要分离的水样进行适度稀释。
③吸取培养液约1毫升放入试管中。
④用微细管吸取稀释水样，在载玻片上滴适当大小的水滴4-5滴。
⑤低倍镜下检查每个水滴。
⑥若水滴中含有1个或2个要分离的藻细胞，立刻将该滴水冲入试管中。
⑦用脱脂棉堵塞试管口，防污染
注意事项：①藻液稀释要适度。②水滴大小要适当。③整个操作过程要迅速
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| New comers to the United States are often 1 by the schools. American schools 2 so different from schools they know in 3 of the world. American education is based on the 4 children 5 learn to think 6 . The school should be the 7 they learn to do this. 8 , children learn the "three R's" (Reading, Writing and Arithmetic), history and government(often called Social Studies) and many other 9 . They also learn 10 be independent(独立的), how to make their own judgment(判断), and how to develop their own 11 and interests. The American teacher does not 12 children in her class to sit 13 folded quietly and to say 14 . She wants them to listen attentively, to ask questions. She knows that 15 children learn from books is 16 . She also knows that, it is necessary for them to know how to use this 17 their 18 development. During Open School Week, parents have a 19 see how American education 20 . | ||||
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