试题与答案

多在安静休息或睡眠时发病的是() A.脑血栓形成 B.短暂脑缺血发作 C.脑栓塞 D

题型:单项选择题 B型题

题目:

多在安静休息或睡眠时发病的是()

A.脑血栓形成

B.短暂脑缺血发作

C.脑栓塞

D.高血压性脑出血

E.蛛网膜下腔出血

答案:

参考答案:A

解析:1.高血压性脑出血多在白天活动或情绪激动时发作,发作时有肢体瘫痪。 2.脑血栓形成多在安静休息或睡眠时发作。

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直到1990年,在墨西哥尤卡坦半岛的一支石油勘探队偶然发现了一个巨大的陨石坑。这个陨石坑的绝大部分淹没在尤卡坦半岛附近的海底,宽度大约为160至240千米。覆盖陨石坑的沉积物的年代表明,这个巨大的陨石坑大约是在6500万年前形成的,正好与恐龙灭绝的年代吻合。这一证据的发现使科学家们基本达成了共识:恐龙的灭绝正是由于这颗陨石对地球的撞击造成的。 这段话表明这样一个观点( )。

A.1990年之前没人会认为恐龙的灭绝是由于陨石对地球撞击造成的

B.陨石坑的发现使科学家对恐龙灭绝的原因的认识更加一致

C.6500万年前的尤卡坦半岛附近地区是恐龙密集的地方

D.陨石的坠毁是自然现象

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