试述通货膨胀形成的理论原因，并结合国情论述我国通货膨胀形成的特点

阅读下面短文,然后从各小题所给的四个选项中选出最佳选项.

    People in Canada often talk about the weather. Do you want to know about the weather in Canada?

Let's look at what the seasons are like in Canada.

Spring

  Spring starts in April, with lots of rain. The weather is still cool.Spring is a very short season and before

you know  lt,  summer arrives!

Summer

  The summer starts in late May or early June. Summer can be very hot in Ottawa. It is also very wet.

People like wearing shorts and T-shirts in summer.

Autumn

   Autumn comes in September or October. It is a very beautiful season. The leaves on the trees become

colorful: orange, red, yellow ... It is neither too cold nor too hot in autumn.

Winter

    The winter is from late November to late March. It can be very cold, with lots of snow. It is often sunny in winter, but the sunniest days are always the coldest!

1. How many seasons does the writer talk about?         

A. One.      

B. Two.        

C. Three.    

D. Four.

2. How is the weather in summer?

A. Warm and rainy.

B. Wet and cold.

C. Hot and wet.

D. Hot and dry.

3. The leaves on the trees become colorful in______.                   

 A. spring    

B. summer

C. autumn    

D. winter

4. The winter ends in _____,

A. late March

B. late November      

C. early April

D. early October

5. What's the main idea of the passage?           

A. The people in Canada.

B. The seasons in Canada.

C. The famous places in Canada.

D. The foods in Canada.

下列说法中正确的是（　　）

A．三角形的高一定在三角形内

B．三角形的内角中一定有一个直角

C．三角形的内角中最少有两个锐角

D．三角形的中线不一定在三角形内

关于图书条形码的错误说法是？（）

A.图书条形码是系统中每本图书的唯一标识

B.图书条形码在系统中不能有重复

C.图书条形码在系统中可以重复

简述水痘的临床表现。

对水位变化的影响，下列说法中不正确的是（）。

A、冷态启动初次投粉时水位上升；

B、汽压愈低，压力变化时水位变化愈大；

C、高压加热器跳闸瞬间水位上升；

D、甩负荷瞬间汽包水位下降。