题目

 We're nearing the peak of the 11-year solar cycle, so double-check your GPS and watch where you're going. On Thursday, the sun suddenly gave off a massive solar flare. Solar flares can disrupt(使中断) radio communications, including devices that use Global Positioning System technology, such as cell phones, airplanes and car navigation（导航） systems. So if you're relying on your GPS for driving directions, to find your location on your phone's mapping tool or for any other purpose, have a backup navigation system handy, such as a printed map. Even more importantly, pay close若X～B(n，p)，且E(X)＝6，D(X)＝3，则P(X＝1)的值为(　　)A．3·2－2 B．2－4 C．3·2－10 D．2－8