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女孩，2岁，因发热半天，呕吐2次，半小时前突然面色发灰，四肢发冷，来院急诊。体检：体温40℃，精神萎靡，重病容，血压4／0kPa，心率16.0次／分，腹软，巴氏征、布氏征均阴性。肛拭大便常规：白细胞：10～20／HP，红细胞0～1／HP，吞噬细胞0～1／HP，临床诊断为中毒型细菌性痢疾。

急性细菌性痢疾的基本病变应为（）

A.弥漫性纤维蛋白渗出性炎症

B.结肠黏膜弥漫性充血水肿

C.肠黏膜呈节段性、坏死性炎症

D.肠黏膜呈点状坏死和溶解

E.肠黏膜组织溶解性坏死形成溃疡

答案

参考答案：B

单项选择题

下列各项属于领导与被领导关系的一项是（）。

A． A省人民政府和A省教育厅

B．国家教育部和A省教育厅

C．A省教育厅和A省M市教育局

D．A省教育厅和B省教育厅
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单项选择题

Why do airplanes take longer to fly west than east

It can take five hours to go west-east from New York(NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon known as the jet(喷射) stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes moving at a constant air speed thus go faster in the west- east direction when they are moving with the wind than in the opposite direction.

2. What would happen if the gravity on Earth was suddenly turned off

Supposing we could magically turn off gravity. Would buildings and other structures (建筑物) float away What happened would depend on how ply the things were attached to the Earth, The Earth is moving at quite a speed, moving at over a thousand miles per hours. If you turn something around your head on a string(细绳) , it goes around in a circle until you let go of the string. Then it flies off in a straight line. ’ Switching off’ gravity would be like letting go of the string. Things not attached to the Earth would fly off in a straight line. People in buildings would suddenly shoot up-wards at a great speed until they hit the ceiling. Most things outside would fly off into space.

It can be inferred that without gravity（）.

A. buildings and other structures would float away

B. trees and buildings would not easily fly off

C. something around your head would not fly away

D. everything outside buildings would fly off into space
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