证券公司自营业务应当建立健全相对集中、权责统一的投资决策与授权机制（）
参考答案：对
根据下面对话中的情景，在每个空白处填人一个适当的句子，使对话恢复完整。
A: Hi, Alice! A nice day, isn't it?
B:Yes.1 ______________ !
A:Tomorrow?Tomorrow is not a good day for playing football!
B:2_____________?
A:I listened t()the weather report. It says it's going to be rainy and windy.
B:3______________! If it rains, we have to stay at home and do 'some reading.
A: Why not come to my home to play computer games? My father bought different parts of the computer and put them together. He made our own computer last week.
B: Greati But 4_______________________?
A: My home is near our school, lt's a white building. I live on the fourth floor.
B:OK! 5____________________!
A: See you.
右图为某遗传病的系谱图，致病基因为A或a。请回答下列问题
Ⅰ-2和Ⅱ-3的基因型相同的概率是（）
