Tina and Vera are sisters. They live in a big city. Tina is not as old____Vera. She is older than her. She thinks living in the city is much____(interesting)than in the countryside. She likes the lights in her city. She thinks the lights in her city are the ____(beautiful) in the world. She enjoys____(read) and she reads____(many)books than Vera.____, Vera dislikes living in the city. She thinks living in the countryside____(be) much better. She often____(visit) her grandparents in the countryside and takes vacations there. She often takes walks____ supper. It makes her____(feel) very relaxed.

科学家发现人与黑猩猩的细胞色素C差异最小，与马的差异则大一些，而与果蝇、向日葵的差异更大．科学家研究的方法是（　　）

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--- You look beautiful today，Miss Wang.
---_________________. 

与-3ab是同类项的是（  ）