A．watched Grylls' TV program regularly

　　B．did the right things in the dangerous situation

　　C．created some tips for survival

　　D．was very hard­working

　　解析：B　推理判断题。根据最后一段since he knew better than anyone how hard Nicholas had to work to stay alive.可知，Grylls比其他任何人都懂得 Nicholas逃生的艰难，所以他对男孩留下了深刻的印象。

　　B

　　New research from the University of Miami is showing that languages with complex tones-like Mandarin - tend to occur more often in wet regions, while languages with simple tones - like Swedish - occur in dry regions.

　　"English is a non­tonal language which originates in a relatively dry part of the world. It's in the top 15 percent of the 'driest' languages. This fits with our hypothesis (假说). It's perfectly possible that the English language could adopt tones in areas that are now more humid，or as the climate changes，"says Sean Roberts, who works on global differences in geophonetics(地理语音学)．The research changes how language evolution is understood, with data drawn from over half the world's tongues. "Broadly, this suggests another non­conscious way in which humans have adapted to their very different and extremely cruel environments，" says Caleb Everett，the researcher on the project."Also, there may be some health benefits to certain sound patterns in certain climates, but more research is needed."Breathing in dry air may cause a speaker's voice box to lose too much water, decreasing voice range.

　　"There's a hypothesis several anthropologists，who study people，society and culture, have put forward that languages in warmer climates such as Kenya tend to have higher rates of mouth opening，" says Everett.

　　 "Languages do gain and lose tones, and can do so quite quickly. Ancient dialects of Chinese had no tone, and Korean is currently undergoing'tonogenesis' (gaining tones)，" adds Roberts. At present, it's very difficult to say whether very early languages had tones or not.

"One of the things we'll be researching next is whether languages gain or lose