诱发动物全身性Shwartzman反应时，第一次注入小剂量内毒素的作用

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问题单项选择题

诱发动物全身性Shwartzman反应时，第一次注入小剂量内毒素的作用是（）

A.激活动物体内凝血系统

B.使血管内皮细胞受损

C.消耗体内凝血抑制物

D.引起轻度休克

E.封闭单核吞噬细胞系统

答案

参考答案：E

综合

读下列材料，回答下列问题。（6分）

材料一位于美国东南部的田纳西河流域曾经是美国最贫穷的地区之一，后来经过该流域管理局（简称TVA）的治理，从根本上改变了流域落后的面貌。TVA的管理成为流域管理的一个独特和成功的范例而为世界所瞩目。

材料二黄河某段与田纳西河流域图

（1）美国田纳西河蕴藏着丰富的水能资源，试分析其水能资源丰富的原因。（2分）

（２）从图中特点可知，田纳西河与黄河水能资源开发的共同特点是（0．5分）

（３）20世纪30年代，田纳西河流域农业发展中，自然资源遭到破坏，生态环境恶化，灾害频繁。具体表现在：（1．5分）

资源破坏：　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

生态环境恶化：　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

灾害频繁：　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

（４）美国田纳西河流域综合治理的成功经验，对我国河流治理，最值得借鉴的方面有哪些？　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　（2分）

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填空题

An Event of Imagination

The year is 2094. It has been announced that a comet is heading towards the Earth. Most of it will miss our planet, but two pieces will probably hit the southern half of the Earth.
On 17 July, a piece about/for four kilometers wide enters the Earth’s atmosphere with a massive explosion.
About half of the piece is destroyed, but the remaining part hits the South Atlantic at 200 times the speed of sound. The sea boils and a huge hole is made in the seabed. Huge waves are created and spread outwards from the hole. The wall of water, a kilometer high, rushes towards southern Africa at 800 kilometers an hour. Cities on the African coast are totally destroyed and millions of people are drowned.
Before the waves reach South America, the second piece of the comet lands in Argentina.
Earthquakes and volcanoes are set off in the Andes Mountains. The shock waves move north into California and all around the Pacific Ocean. The cities of Los Angeles, San Francisco and Tokyo are completely destroyed by earthquakes. Millions of people in the southern half of the earth are already dead, but the north won’t escape for long. Because of the explosions, the sun is hidden by clouds of dust, and temperature around the world falls to almost zero. Crops are ruined. The sun won’t be seen again for many years. Wars break out as countries fight for food. A year later, no more than 10 million remain alive.
Could it really happen In fact, it has already happened more than once in the history of the Earth. The dinosaurs (恐龙) were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a piece of object in space. The dinosaurs couldn’t live through the cold climate that followed and they died out. Will we meet the same end

Reasons	Results
One piece hits the South Atlantic at 200 times faster than the speed of sound.	The sea (46) and a huge hole is made in the seabed. A tsunami(海啸) hits southern Africa, (47) cities on the African coast, and (48) millions of people.




A (49) (50) happens when the four-kilo- meter-wide piece of comet enters the Earth’s (51)	The sun is (52) . by clouds of dust and the temperature falls to almost zero, (53) crops. Wars break out for food and only 10 million people remain. The human beings are (54) the danger of (55) out.

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