主要由串珠镰刀菌产生的霉菌毒素是()
A.伏马菌素
B.丁烯酸内酯
C.玉米赤霉烯酮
D.T-2毒素
E.3-硝基丙酸
参考答案:A
—Will you buy the red T-shirt or the black one?
—I will buy ______ of them. One is for my brother and the other is for my father.
A.both
B.either
C.neither
D.all
人类基因有多少对碱基对排列?