工业上高纯硅可通过下列反应制取：SiCl₄（g）+2H₂（g） $\underset{\_}{\underset{\_}{高温}}$  Si（s）+4HCl（g），（已知1mol晶体Si中有2molSi﹣Si键），该反应的产生的热量为（   ）

    I like school days. I can learn many things from school. We have four classes in the morning and two in the afternoon. I like weekends, too. We don't go to school on Saturdays and Sundays. I often play ping-pong and play basketball on Saturday morning. I often play the violin (小提琴) on Saturday afternoon. I often do homework and play football on Sunday morning. I often go to the park on Sunday afternoon.

点P（-3，1）在椭圆$C:\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\left(a>b>0\right)$的左准线上,过点P且方向为$\overrightarrow{a}$=（2，-5）的光线经直线y=－2反射后通过椭圆的左焦点，则此椭圆离心率为(    ）