舌前2/3的边缘及外侧淋巴管一部分引流至下颌下淋巴结，另一部分引流至
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.IfyouhavereallybeenstudyingEnglishforsolong,it’sabouttimeyou_____abletowritelettersinEnglish.
Thecountry’schiefexportsarecoal,carsandcottongoods,cars_____themostimportantofthese.
Whileintegrasedeletesanimmunecell'sgeneticmaterialandreplacesitwithitsown,itactslike________inawordprocessor.