主变压器重瓦斯动作是由于（）造成的。A、主变压器两侧断路器跳闸； B、220KV套管

阅读短文，判断正误。

     It was the third day of Spring Festival. While I was in bed. I heard someone crying. It was snowing

outside and it was so deep. I got up quickly and looked out of the window. Ah! It was all white outside.

What a beautiful world! Without thinking about the cold. I left my warm sleeping bed and dressed myself

hurriedly. As soon as I finished my breakfast, I ran out into the white world. How deep the snow was!

Many children were in the white world. Some were making snowmen, some were running after each other.

Their faces were all red. But all the children were having a good time.

Notes:

deep adj. 深的，厚的

without conj. 没有

hurriedlyadv. 快速地

as soon as ……尽快

( )1. The story happened on the second day of the Spring Festival.

( )2. It was raining heavily at that time.

( )3. Without having breakfast, the writer ran out into the white world.

( )4. There were not many children in the snow because they were afraid of being cold.

( )5. They were playing happily.

涝渍灾害是我国主要自然灾害之一。下图是我国涝渍灾害主要分布地区示意图。读图回答下列问题。

（1）说明图示涝渍灾害空间分布形成的原因。 

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（2）如何有效预防涝渍灾害？ 

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根据《屋面工程技术规范》要求，低层建筑及檐高小于（）m的屋面，可采用无组织排水。

A.50

B.30

C.20

D.10

下面四种食物中，哪一种是营养素及微量元素的最佳载体（）

A、方便面

B、挂面

C、饼干

D、馒头