However, rudeness is never acceptable. Don't assume it is OK to be rude if the person you're in touch with won't recognize you. If you have something awful to say, have the courage to face the person and say it, write a letter or email and sign it, or forget it. Upsetting people with unsigned messages is cruel and disgusting.

　　We shouldn't blame technology for our shortcomings.Technology is here to help us，but we should not allow it to take over our lives. An important step is acknowledging our shortcomings.People spend a lot of time pointing out bad manners but it would be even more helpful if we'd publicly acknowledge good manners when we see them.

　　68．What can be inferred from the underlined sentence in Paragraph 1?

　　A．People can tell good from bad behavior.

　　B．Radar is able to observe human behavior.

　　C．People care little about their behavior.

　　D．Radar can be used to predict human behavior.

　　69．Some people are less willing to deal with humans because ________．

　　A．they are becoming less patient

　　B．they are growing too independent

　　C．they have to handle many important messages

　　D．they have to follow an evolutionary step backward

　　70．The author thinks sending unsigned awful messages is ________．

　　A．ridiculous

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