[填空题]

AIDS

As a science writer, I don’t have to wear emotional armor very often. Before I went to Zimbabwe for a visit, I had talked to other reporters (46) . All told me to get prepared for the orphans, many of whom had caught the AIDS virus from their mothers and the strong desire to make everything all right for them.
Then again, nothing could have prepared me for the visit to creche (育婴堂) for AIDS orphans in Harare, where one sick, smiling four-year-old boy tried to keep up with the other kids playing ring-around-the-rosy but (47) , or meeting a 25-year-old unmarried girl who cared for her nephew (48) . The boy who called his aunt "Mama" was too weak even to take the piece of banana I offered.
Meanwhile photo journalist Karin Retief was visiting a room at the hospice (济贫院 ) (49) . At first she did not see anyone on the bed and was about to say he must be elsewhere, when suddenly she spotted his tiny arm

[单项选择]Science writer Tom Standage draws apt parallels between the telegraph and the gem of late 20th century technology, the Internet. Both systems grew out of the cutting edge science of their time. The telegraph’s land lines, underwater cables, and clicking gadgets reflected the 19th century’s research in electromagnetism. The Internet’s computers and high-speed connections reflect 20th century computer science, information theory, and materials technology.
But, while ’inventions make a global network possible, it takes human cooperation to make it happen. Standage’s insight in this regard adds depth to his technological history. It underscores the relevance to our own time of the struggles of Samuel Morse in America, William Cooke in England, and other telegraph pioneers. They made the technology work efficiently, sold it to a skeptical public, and overcame national and international bureaucratic obstacles. The solutions they found smooth the Internet’s way today.
Consider a
A. The telegraph.
B. Information theory.
C. Materials technology.
D. The Internet.