题目

It is the largest and most detailed ever 3D map of the universe（宇宙）- and a journey back in time 11billion years. Scientists have studied the brightest objects in the sky to come up with the  image of the universe they have ever made. Experts said looking at the image was similar to “looking at the moon through the clouds”. But because the light took a long time to reach Earth it is also a window back to 11billion years ago when galaxies (星系) were first coming together and forming large clusters. Earlier such images had used galaxies to map the universe and were only ab已知P（4，-9），Q（-2，3）且Y轴与线段PQ交于M，则Q分MP的比为（　　）A．-2B．-13C．12D．3