单项选择题
杜能在《孤立国》中提出六种耕作制度，每种耕作制度构成一个区域，而每个区域都以城市为中心，围绕城市呈同心圆状分布，这就是著名的“杜能圈”，其中的第三圈是（）。
A．自由农作区
B．草田轮作区
C．谷物轮作区
D．畜牧业区
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相关考题
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单项选择题
M：My briefcase is just like yours，isn’t it？W：Almost．Mine is smaller，but it doesn’t have a lock．I think I’d rather have had one like yours．Q：Why does the woman want a briefcase like the man’s？（）
A．Because they are alike.
B．Because the man's briefcase has a lock.
C．Because the man's briefcase is smaller.
D．Because she doesn't have a briefcase. -
单项选择题
Kevin Rogers used to be my boss. At that time he was a hardworking, up-and-coming businessman and a real slave-driver, always telling us we had to sell more and more. As soon as I could, I got a job with another company. The last time I saw Rogers was more than ten years ago. At least that's what I thought until last Thursday. But now I'm not so sure. I was on my way back to my office in the center of town. There is a small park nearby which I sometimes walk through after lunch. It was almost empty, except for an unshaven, shabby-looking man on one of the benches. He looked about fifty years old and was wearing an old, grey overcoat. It was a cold, wintry day, and he was shivering. 'It's been a long time since I had a meal. Can you help me?' he said. There was something about his voice that sounded familiar. I gave him a few coins and he mumbled something about being grateful. As he stumbled past me, I looked at his face closely. I wondered where I had seen him before. Then it hit me. Could it possibly be ''? No! Impossible, I thought I watched him walking away. He was the same height as Rogers but looked a lot thinner than I remembered. Then, as he left the park and turned down the street, I caught sight of his face again, this time in profile. Then nose was the same as Rogers, too. I almost followed him but something made me stop. I just couldn't be sure. But the resemblance was very close. Yesterday I run into someone who had worked for Rogers at the same time I did, and had stayed no longer. I started telling him about the man I had seen in the park. For a moment I thought it was our old boss. The voice, the nose, and even the face were just like Rogers. But it couldn't have been. 'Rogers must be the director of a big company by now,' I said. My ex-colleague shook his head, 'I thought you knew.' 'Knew? Knew what? What are you talking about?' 'Rogers was sent to prison six years ago. He's sleeping on park benches and begging money from passers-by.'It seems that when Rogers was the writer's boss, the writer ______.A．rather liked Rogers.B．admired Rogers' ability to sellC．thought Rogers was lazyD．was not very happy in his job
A.
B.
C.
D.
E.'
F.'
It
G.
A．rather
H.
B．admired
I.thought
J.was -
单项选择题
在UML的各种视图中，(45)显示外部参与者观察到的系统功能；(46)从系统的静态结构和动态行为角度显示系统内部如何实现系统的功能；(47)显示的是源代码以及实际执行代码的组织结构。
A.用例视图
B．进程视图
C．实现视图
D．逻辑视图
