立体交叉适用于快速、有连续交通要求的大交通量交叉口，可分为两大类，下列分类正确的是( )。
A．简单立交和复杂立交
B．定向立交和非定向立交
C．分离式立交和互通式立交
D．直道式立交和环形立交
参考答案：C
解析：立体交叉按交通功能划分，可分为互通式立体交叉和分离式立体交叉。按相交路线跨越方式划分，可分为上跨式和下穿式。按相交道路的条数划分，可分为三条路立交、四条路立交、多条路立交。按交叉口交通流线的相互关系划分，可分为完全立交、交织形立交、不安全立交。按立体交叉结构层次划分，可分为两层式、三层式、四层及四层以上式。
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| I can still remember it like it was yesterday. I was a college freshman and had 1 up most of the night before laughing and talking with friends. Now just before my first 2 of the day my eyelids were feeling heavier and heavier and my he ad was drifting down to my desk to make my textbook a 3 . A few minutes nap (瞌睡) time before class couldn't 4 , I thought. BOOM! I lifted my head suddenly and my eyes opened wider than saucers. I looked around with my 5 beating wildly trying to find the cause of the 6 . My young professor was looking back at me with a boyish smile on his face. He had 7 dropped the textbooks he was carrying onto his desk. "Good morning!", he said still 8 . "I am glad to see everyone is 9 . Now let's get started." For the next hour I wasn't sleepy at all. It wasn't from the 10 of my professor's textbook alarm clock either. It was instead from the 11 discussion he led. With knowledge and good 12 he made the material come 13 . His insights were full of both wisdom and loving-kindness. And the enthusiasm and joy that he 14 with were contagious (富有感染力的). I 15 the classroom not only wide awake, but a little 16 and a little better as well. I learned something far more important than not 17 in class that day too. I learned that if you are going to do something in this life, do it well, do it with 18 . What a wonderful place this would be if all of us did our work joyously and well. Don't sleepwalk your way through 19 then. Wake up! Let your love fill your work. Life is too 20 not to live it well. | ||||
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