题干

对神经调节有关的叙述错误的是(  )

A:感受器受到刺激后,不一定产生兴奋

B:兴奋在神经细胞间的传递也可以是双向的

C:神经纤维上兴奋传导的方向与膜内局部电流的方向一致

D:脑中的高级中枢可以调控脊髓中的低级中枢

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答案(点此获取答案解析)

B

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    Fei-Fei Li arrived in the U. S. from China at age 16 with many big dreams. And it took many unusual jobs to help her achieve them. Luckily, she was smart and extremely driven. And today, she's the director of Stanford University's artificial intelligence lab.

    As one of the leaders in the world for A. L., I feel much excitement and responsibility to create the most awesome and excellent technology for society and to educate the most awesome and excellent technologists—that's my calling.” Li said.

    She is also a loyal advocate for diversity in the tech industry.

    “I see extremely talented Stanford PhD students struggling with their visas and I find it unthinkable that we create so many barriers for the talents of the world, Li said. While Li was in college at Princeton, she borrowed money from friends and even her high school math teacher to run a dry-cleaning business for her parents in order to help them get by. Li attended classes during the week and worked at the business on the weekends. Then, when Li was in graduate school, her mom developed cancer and had a stroke (中风). It was difficult to keep moving ahead while all of this was happening. The real existential challenge is to live up to your fullest potential, live up to your sense of responsibility and to be honest to yourself about your dreams while doing it, she said.

    Li was named a Great Immigrant of 2016 by the Carnegie Corporation, the nation's oldest grant making foundation which honors roughly 40 naturalized U. S. citizens each year. Her graduate studies were supported by the Paul & Daisy Soros Fellowships for New Americans.