若反比例函数y＝ $\frac{k-3}{x}$的图象经过点（1，-2），则k的值为（        ）

下列句中没语病的一项是 （      ）

资料1：巴斯德毕赤酵母菌是一种甲基营养型酵母菌，能将甲醇作为其唯一碳源，此时AOX1基因受到诱导而表达【5′AOX1和3′AOX1（TT）分别是基因AOX1的启动子和终止子】．

资料2：巴斯德毕赤酵母菌体内无天然质粒，所以科学家改造出了图1所示的pPIC9K质粒用作载体，其与目的基因形成的重组质粒经酶切后可以与酵母菌染色体发生同源重组，将目的基因整合于染色体中以实现表达．

资料3：限制酶切位点

Jill: Alice, Peter and Mike are talking on the Internet.

Peter: I like playing the v____. Sometimes I go to the hall with my friends and play it there.

Alice: I like playing the g____. I go to the____every Friday afternoon.

Jill: My brother Ben and I love m____. We always play the drum together after school.

Mike: I am a school volunteer(志愿者). Sometimes I play the t____for the old men. They are happy.