设曲线$y=a{x}^2$在点$\left(1,a\right)$处的切线与直线$2x-y-6=0$平行，则$a=$（   ）

①Jill    basketball    funny    student number    near our school    only six

②is her name rose     yes her name is rose

I think July is ____ (hot) than any other month in our country. It's ____ (hot) month of the year.

下图是“某海湾围海造地前后的对比图”。指出围填海前后的变化，并就其中一项变化，说明其对环境带来的负面影响及对策。