Danny's father is a firefighter. He works at fire station. He's very brave. He h____ short yellow hair. He is tall and thin. His c____ are orange. He likes putting out the f____. Danny's mother is a t____. She works in a school. Her students like her very much. She has a b____ and two dresses. They are purple.

    They are nice. She likes playing games with her students. She is a good teacher.

①y=x²sinx   ②y=sinx，x∈ ③y=xcosx，x∈ ④y=tanx．

优生与家族幸福密切相关。下列不属于优生措施的是（  ）