获得治疗性基因的方法包括
A. 真核基因组文库
B. cDNA文库
C. PCR扩增
D. 人工合成
E. 以上都是
Choose the proper word to fill in the blanks.Can you ________ a fifty-yuan note? (give/change)
Hello. I want to_________ my IC card. (recharge/charge)
Ok. Wait a _________ , please. (minute/ago)