下列高科技成果中,根据基因重组原理进行的是( )① 我国科学家袁隆平利用杂交技术培育出超级水稻② 我国科学家将苏云金杆菌的某些基因移植到棉花体内,培育出抗虫棉③ 我国科学家通过返回式卫星搭载种子培育出太空椒④ 我国科学家通过体细胞克隆技术培养出克隆牛A ① B ①② C ①②③ D ②③④
My arm is still painful,_______I'm going to see a doctor.( )
A.soB.forC.butD.or
The little boy has just had lunch.He _____be hungry already.( )
A.must.B.mustn'tC.canD.can't
Do you plan to watch a talent show or a sports show tonight?
______.I can't stand them.I plan to watch a sitcom.( )
A.NeitherB.BothC.NoneD.Either
A couple from Australia welcomed five healthy babies ____January.( )
A.atB.inC.forD.on
Paul went to the bookstore with some friends of________.( )
A.heB.himC.himselfD.his