(Although) absolute zero cannot (actually) be reached, Approximations of (less than) 0.001 degrees Celsius above absolute zero have been (created) the laboratory. 答案:D
Socialization, (which begins) in (child), is a process by which people become members of a society, learning (its) norms, customs, laws, and (ways) of living. 答案:B
Nicolas, first ,I'd like to thank you for your compliment(on my article about the Listening script). But, I have to say that I'm sorry ,my favor is with Lycyyyh's answer.
begin--- signifies "time" , Please go check a dictionary. You won't find any usage of "begin" as "begin in people". That's kind of Chinese thinking.