句型转换
(1)Both he and I are from Beijing.,（改为否定句）
____ he____  I am from Beijing
(2)The box is too big for me to carry.(同义句转换)
The box is____  big____  I can’t carry it.
(3)I like this CD because I can take it to the party.（对划线部分提问）
____ do you ____  CD?
(4)My mother allows me to choose my own clothes.( 同义句转换)
I ____  ____   to choose my own clothes
(5)I spent one hundred Yuan in buying the present.（同义句转换）
The present____  ____ one hundred Yuan

已知色盲症受隐性基因控制，色盲基因b和色觉正常基因B都只存在于X染色体上，Y染色体上既无b也无B．现有一色盲男孩，其父母、祖父母、外祖父母色觉均正常，则这个男孩的色盲基因来自（　　）