H7N9禽流感是今年在我国部分省市出现的一种传染病．对此，我们采取了许多有效措施，以下哪条措施属于控制传染源(    )

阅读下面短文，从各题所给的选项中选出最佳答案。    

    Liu Lin, a student at Chengdu University, made a big decision last August. She decided to take her 93-year-old grandmother from their hometown and to 1 with her in a rented room not far from the university.

    Why did she do so? Because many  2 things happened to her family last year. In March, her grandmother broke her leg. In April, her father passed away. Her mother, plagued(折磨) by these 3 , lost the ability to take care of others.

    This was the only choice for her 4 no one else could care for her grandmother. The old woman's three sons have all died, and Liu Lin couldn't leave5 alone at home where nobody could look after her.

    A room with two beds, a wardrobe(衣柜), a desk and a table is their new 6  in Chengdu. The room costs 600 yuan per month. Liu Lin's younger brother works in the same city and  7 most of his 2,000 yuan salary(工资) supporting the family.

Liu Lin and her brother were brought up by their  8 . Even though she could not read a clock, their grandmother prepared lunch on time every day when they were 9. They think it's their turn to look after her now.

    Liu Lin has  10  a work-study program from the university to help support the family. She reduces help from others. At present, the girl is able to support the family.