简述垄断优势理论。

阅读理解。

     This is a boy. His name is Tom. He has a nice cat. It is an English cat. His friends are Lucy and Mike.

They have cats, too. Their names are Mimi and Maomao. They are Chinese cats. The English cat is five.

The Chinese cats are three. They like their cats.

     Today they can't find the English cat and the Chinese cats. They ask an old man, "Where are our cats?" "I don't know." He says, "Are they in the tree?" Tom and Mike say. "Listen, listen!" Lucy says.

"Miaow, miaow……." " Oh, over there." They go to the tree, and carry (抱) them down.

根据短文内容，判断下列句子正（T）误（F）。 

( )1. Tom has a good English cat.

(     )2. Tom has four friends.

(     )3. The English cat is three and the Chinese cats are five.

(     )4. Tom and his friends have six cats.

(     )5. Their cats are in a tree.

女性，23岁。发热、腹泻便秘交替8个月住院。发热以下午及傍晚为重，体温可达38.5C，夜间盗汗，食欲不振，常有腹泻便秘交替。体检：消瘦，右下腹部轻度压痛。粪便镜检白细胞0-3个／HP，细菌培养3次均阴性，为明确诊断下列哪项检查最重要（）。

A.胸部X线摄片

B.纤维胃镜检查

C.胃肠钡餐检查

D.旧结核菌素试验

E.血沉测定

把5N的水装入底面积为10cm²的容器中，水的深度为20cm，则水对底部的压力为__________N，对底部的压强为____________Pa。

阅读材料，回答问题。

此事变是中国一部分民族资产阶级的代表，也是国民党中实力派之一部，不满意南京政府的对日政策，要求立即停止“剿共”，停止一切内战，一致抗日，并接受了中共抗日主张的结果。

（1）材料中的“事变”指什么事件？

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（2）此“事变”的发动者是谁？

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（3）中 * * 党为什么要和平解决此“事变”？

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肾穿刺的肾组织在解剖显微镜下肾小球呈（）

A.针尖大小的白色点状

B.针尖大小的红色点状

C.针尖大小的黄色点状

D.红 * * 状

E.黄 * * 状