.

　　A.beneficial，because their inventors are famous

　　B.beneficial，though their inventors are less famous

　　C.not useful，because their inventors are less famous

　　D.not useful，though their inventors are famous

　　解析　推理判断题。根据第一段内容结合下文可推断，作者提到交通信号灯、雨刮器等发明，是想说无数的发明对人类十分有益，虽然它们的发明者没有太大的名气。

　　考题印证

　　A

　　(2011·山东卷·C)Diana Jacobs thought her family had a workable plan to pay for college for her 21­year­old twin sons：a combination of savings，income，scholarships，and a modest amount of borrowing.Then her husband lost his job，and the plan fell apart.

　　“I have two kids in college，and I want to say ‘come home’，but at the same time I want to provide them with a good education，” says Jacobs.

　　The Jacobs family did work out a solution：They asked and received more aid from the schools，and each son increased his borrowing to the maximum amount through the federal loan (贷款) program.They will each graduate with $20,000 of debt，but at least they will be able to finish school.

　　With unemployment rising，financial aid administrators expect to hear from more families like the Jacobses.More students are applying for aid，and more families expect to need student loans.College administrators are concerned that they will not have enough aid money to go around.

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