D．temperature rise has had no effect on future productivity patterns

　　解析：推理判断题。由文章最后一段中的内容可推知各种因素共同影响将来的生产力，故选B项。

　　答案：B

　　B

　　(2017·淮北高三阶段测试)As the new term starts, freshmen around the world are asking the same question: how can I make the best of four years at college? The New York Times received suggestions recently from PhD students and seniors at some of the top US universities. Here's their advice.

　　“Many young people today are raised in a protective cocoon (茧)”， wrote Tim Novikoff, a PhD student at Comell.“College is a time to explore the world beyond and a chance to

　　learn new things about yourself. Take classes in different subjects. Try lots of different clubs and activities.”

　　Remember also to take some time away from campus, suggested Willie Lin, a student at Washington University.“If_you_spend_all_of_your_time_in_school,_then_it_becomes_too_easy_to_let_criticism_from_an_unkind_professor_or_a_conflict_with_a_roommate_take_up_large_proportions.”

　　Try to find work assisting a researcher or a professor — this is the advice from Aman Singh Gill, a PhD student at Stony Brook University. And he also said，“With a window into the world of research, you will find yourself thinking more critically, accepting fewer states at face value and perhaps developing a brave sense of what you can accomplish.”

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