D．Unsupportive.

　　答案　D　[观点态度题。根据第四段中的“...our relationships are not dependent on the quantity of our communication.They depend on quality...”和第五段中的“But people who want to...can be disappointed”可知，Dr.Roberts对Facebook的态度是不支持的。故选D。]

　　Ⅱ.根据短文内容，从短文后的选项中

　　Most cars have seat belts as part of their equipment.Seat belts protect drivers and passengers in case of accidents.They also reduce the effect of a crash on the body.__9__Worldwide，the devices have protected up to a million people.

　　America first recognized the invention of an automobile seat belt in 1849.The government gave a patent to an engineer named Edward Claghorn of New York City so that others would not copy his invention of a safety device.__10__ This early version of safety belt was said to include hooks and other attachments for securing the person to a fixed object.

　　Other inventors followed with different versions of the seat belt.__11__ It resulted from the work of a Swedish engineer，Nils Bohlin.His three－point，lap and shoulder seat belt first appeared on cars in Europe 50 years ago.

　　Nils Bohlin recognized that both the upper and lower body needed to be held securely in place.His invention contained a cloth strap(带子) that was placed across the chest and another strap across the hips.__12__

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