博耶(H.Boyer)和科恩(S.Coben)将非洲爪蟾核糖体蛋白基因与质粒重组后导入大肠杆菌细胞中进行了表达,该研究除证明了质粒可以作为载体外,还证明了_____(答出两点即可)。
Ice-cream and candies are not healthy food.They ale u_____ food
you ,let ,help ,me
____________________________
shoes(单数)__________
How long ________ they ________ (dig) the ditch?
努力工作 (译成英语 )_________
“Here you are.” “_____(thank).”
she_______(宾格)
试题">
薇甘菊为入侵我国的植物,田野菟丝子茎缠绕在薇甘菊植株上,茎上即可形成吸器吸收薇甘菊植株中的营养物质。
Chinese people are very good at table t_____,and it's our favorite sport