我国杂交水稻研究的创始人,被誉为“杂交水稻之父”的是()
A.汪笃栋
B.乔魁多
C.袁隆平
D.陈一吾
参考答案:C
HBV感染后产生的保护性抗体是()。
A.抗-HBS
B.抗-HBcIgM
C.抗-HBcIgG
D.抗-HBe
E.抗-前S
If you want to book tickets for the 2012 Olympic Games, just call 60952012. It _____be simpler.
A.mustn't
B.won't
C.needn't
D.couldn't