题目

What is the conversation mainly about?A. The woman’s phone.B. The woman’s new sound system.C. The woman’s favorite music. 答案：【答案】B【解析】M: Where is that music coming from?W: My new speakers. I hung them up on the wall over there. They’re so small. You can barely see them.M: The sound quality is great. Are they connected to your computer?W: No, they’re connected to my iPhone, actually.人类的多指(A)对正常指(a)为显性，属于常染色体遗传病。在一个多指患者(Aa)的下列各细胞中，不含或可能不含显性基因A的是：（  ）①神经细胞　②成熟的红细胞　③初级性母细胞　④次级性母细胞　⑤肌肉细胞　⑥成熟的性细胞A.①②⑥　　　　　B.④⑤⑥　　　　　　C.①③⑤　　　　　D.②④⑥