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     Hi, I'm John.There are four seasons in a year. I like them all. In spring, it's warm. There are pretty flowers everywhere. I often go on a picnic with my parents. Summer is hot. I often go swimming in the pool. I like to wear my sunglasses. In fall, the weather is cool. I can help my grandpa pick apples. Winter is white. I can make a snowman. And I can go skating, too.

“房屋产权年限70年到期后怎么办？”是购房者普遍关心的个人问题。从权利角度说这一问题直接指向（    ）