基因型为Aa的一个初级精母细胞和一个初级卵母细胞分别产生的精子和卵细胞基因型的种类数比为[ ]
A.4:1
B.3:1
C.2:1
D.1:1
答案:C
__ is going to see the film Titanic again because this year marks the 100 years since the Titanic sank(沉没) in the ocean.
A.Not only Lily but also her parents
B.Lily as well as Lucy
C.Both Ben and Diana
D.Neither Ben nor Diana
购买信号中客户会表现出的语言信号有()。
A、询问可以提新车时间
B、询问新车装潢的时间
C、询问保险上牌等费用
D、重新要求讲解关注点