书虫闯关

    本学期六年级的必读书目有《草房子》、《男生贾里》、《女生贾梅》、《三国演义》、《汤姆·索耶历险记》、《鲁滨逊飘流记》、《哈利·波特与魔法石》，其中你最喜欢的是（书名）：____，主要人物（至少两个）：____；其中你最欣赏的人物：____。请简要说说你欣赏他的原因：____

It's a sunny day in the farm today. My aunt has a farm. The farm is very small. There are twelve horses, sixteen cows and fifty hens. My aunt likes tomatoes very much. So she has many tomatoes in the farm. Look! The tomatoes are red. They are very beautiful.

It's sunny in the farm today.

已知$\left\{\begin{array}{c}y=1\\ y=3\end{array}\right.$和$\left\{\begin{array}{c}x=0\\ y=-2\end{array}\right.$都是关于x，y的二元一次方程ax-y=b的解，则a、b的值分别是(     )