B．Purple.

　　C．Black.

　　D．Blue.

　　解析：选D。推理判断题。综合全篇可以看出红色领带适合政治家；紫色领带适合商业人士；而新人应避免戴黑色领带，由最后一段中的“Consider blue as the all­purpose tie”和“Blue is the safest color to wear”可知对于新手来说，戴蓝色领带最为保险。

　　C

　　Parties and social gatherings no longer excite us the same way they once did.This is not due to a lack of desire to socialize，but the smartphone.

　　At parties，more people are on their smartphones than on their drinks.According to a recent International Data Corporation study，well over half of all Americans have a smartphone and reach for it the moment they wake up，keeping it in hand all day.In addition，too many people in society are using smartphones while driving and as a result，they get into car crashes.34 percent of teenagers admit to texting while driving，and they confirm that text messaging is their number one driving interruption.People’s attachment to their smartphones is unbelievably becoming more important than the lives of themselves and others.

　　Just as drivers dismiss the importance of focusing while on the road，many people also fail to recognize the significance of human interaction.When with their friends，some people pointlessly check or send text messages in the presence of a friend，which sends a message to that friend：the person I am texting is more important than you.In addition，relying on our smartphones to make friends does not give us the same advantage as being able to make new friendships in the real world.Face­to­face conversations will give us much stronger communication skills in the long run.

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