___ these business tycoons are paying attention to his project testifies to Negroponte’s stature, his powers of persuasions—and the immense appeal of his plan.

a For the ..

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不好意思 我只会第二题
Site visitors provide detailed data, for example, if you are a nurse, the questionnaire wants to know at what kind of hospital; if you are a translator, ___ languages.

a of which b to which c which of d which to

以句子的意思来说，该网站针对网站访客会要你提供详细的资料，如果你是护士，问卷调查表会问你是哪家医院的；如果你是个翻译家，就会问你是翻译哪国语言的。   ps.所以句子中nurse和translator是2个对比的句子，介系词也要用一样!
重点，what kind of hospital的of；比对which of languages的of，只是最后一句是省略的倒装句，所以原本是which of 就变成of which了!
故，答案选a
以上是我个人小小浅见，仅供参考! 如有误，还请其他较专业的大大更正，谢谢!

1.这是一句单句，并非连接两个子句。其他3个答案是用来连接两个句子时的用法。

意思为--->这些商业大亨对他这个计划的关注的这件事实见证了Negroponte他的地位，他的说服能力，以及他这个计划的广大诉求。

2.if you are a translator, the questionnaire wants to know at what kind of languages (you master)

上一句的省略就变为--->if you are a translator, of which languages (you master)-->介系词of 不能省略，代表红色省略的那一部份。


Done!