女，35岁。刻下见咽中不适，如有物梗阻，咯之不出，咽之不下，胸中窒闷，且兼胁痛，呕恶

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     If someone ask you, "What colour is the sky?"I think you will answer "Blue".I'm afraid that you will be

  wrong. The sky has no colour. It looks blue because we are looking at blue sunlight. The sunlight is

 shining on little bits of dust ( 灰尘) in the air.

     Is the sky full of air? I'm sure that you have asked this question, too. We know that there is air all

 around the world, but we couldn't fly very high because as we go higher, the air gets thinner. If we go far

  enough away from the earth, we find there is no air.

     Maybe we can answer some questions now. What is the sky? Where is it? It is all round the world. The

  sky is space (宇宙空间). In space there is nothing, but only the sun, the moon, and all the stars.

1. We often think the sky is blue because _____.

    A. we think it is so

    B. we like this colour

    C. we don't have other colours

    D. we don't like other colours

2. The sky is _____.

    A. a star round it

    B. a big ball with air all

    C. full of dust

    D. space with  the sun, the moon and the stars

3. What makes us think the sky is blue?

    A. Dust in the sky.

    B. Air and blue light.

    C. Our own feeling.

    D. Both A and B.

4. We can't fly very high because _____.

    A. there's too much air in the high place

    B. the high sky is full of dirty air

    C. there is no air in the high enough sky

    D. the sun is too hot

5. The writer of the passage _____.

    A. tells us something about the sky

    B. wants to tell us not to go to space

    C. once flew in the sky

    D. enjoys answering people's questions

非洲是当今世界上缺粮最严重的地区，主要原因是

A 粮食产量低，连年减产

B 人口增长快，人口增长速度超过了粮食增长速度

C 耕地太少，粮食总产量少

D 农业生产的自然条件差

最优资金结构是指在一定条件下使（）的资金结构

A、企业加权平均资金成本最低、企业价值最大

B、企业加权平均资金成本最低、企业价值最小

C、企业加权平均资金成本最高、企业价值最大

D、企业加权平均资金成本最高、企业价值最小

指数型ETF能否发行成功与（）的选择有密切关系。

A．证券交易所 

B．基础指数 

C．受托人 

D．投资者

简述宗教环境对行政组织的影响。