题目

A 13­year­old American boy on Saturday became the youngest climber to conquer Mount Everest，the world’s highest mountain. Jordan Romero from Big  Bear，California，climbed up the 8,850 meter summit (峰顶) from the Tibetan side.On the same day，a Nepali (尼泊尔的)  man，Apa Sherpa，broke his own world record of climbing Everest when he reached the summit for the  twentieth time.Apa Sherpa’s team set off from Nepal’s  capital，Kathmandu，last month，heading for the base camp  (大本营) on the Chinese side of the mountain. “The team has just called in a从10名大学毕业生中选3人，担任村长助理，则甲、乙至少有1人入选，而丙没有入选的不同选法的种数为(　　) A．85　　　　   B．56　　　　 C．49　　　　   D．28