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问题 单项选择题

关于直肠解剖的叙述，不正确的是（）

A.直肠上部与骶骨曲度一致，形成骶曲

B.直肠壶腹前壁与肛管几成直角

C.直肠属腹膜内位器官

D.直肠环肌在下部肥厚形成肛门内括约肌

E.直肠瓣内有环肌纤维

答案

参考答案：C

解析：直肠前面的上2／3有腹膜遮盖，并向前反折形成直肠膀胱陷凹或直肠子宫陷凹。直肠两侧上1／3有腹膜遮盖，且向两侧形成腹膜反折。直肠后壁无腹膜遮盖。其余几项都是正确的。

听力题

根据句意及首字母完成短文内容。（10分）

The police in Washington were looking for a thief. His name was John. As last they c___1____ him. But while they were taking p___2____ of him from the front, from the back, with a hat, without a hat, he suddenly attacked the policemen and r___3___ away. Then a week later the telephone r____4___ in the police station, and a man said, "You’re l___5____for John, aren’t you?"

"Yes."  

"Well, he l___6___ here for New York an hour ago."

New York was f___7___ away form Washington. The city police at once sent four different p____8____ of the thief to the police in New York.

Less than twelve hours l____9___ they got a telephone call form the police in New York, "We have caught three of them, "they said h___10___,"and we will catch the left fourth this evening, we think!"
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解答题

(12分)已知A(1，0)、B(0，－1)、C(－1，2)、D(2，－1)、E(4，2)五个点，抛物线y＝a(x－1)2＋k(a＞0)经过其中的三个点．

(1)求证：C、E两点不可能同时在抛物线y＝a(x－1)2＋k(a＞0)上；

(2)点A在抛物线y＝a(x－1)2＋k(a＞0)上吗？为什么？

(3)求a和k的值．
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