患者男性，45岁，十年前外伤后曾静脉输血治疗，近期持续发热，咳嗽，咳痰，经治疗无明显

在标准状况下，8.96 L甲烷和一氧化碳的混合气体的质量为7.6g，则混合气体的平均相对分子质量为　　  　；混合气体中甲烷的体积分数为　  　　，一氧化碳的质量为　 　 。

The temperature of the sun is over 5000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees at the center．The sun is so much h otter than die earth that matter can exist only as a gas, except at the core．In the core of the sun, the pressures are so great against the gases that, despite the high temperature, there may be a small solid core．However, no one really knows, since the center of the sun can never be directly observed．

Solar astronomers do know that the sun is divided into five layers or zones．Starting at the outside and going down into the sun, the zones are the corona, chromosphere, photosphere, convection zone and finally the core．The first three zones are regarded as the sun's atmosphere．

But since the sun has no solid surface, it is hard to tell where the atmosphere ends and the main

body of the sun begins．

The sun's outermost layer begins about 10000 miles above the visible surface and goes outward for mllions of miles．This is the only part of the sun that can be seen during an eclipse（日食） such as the one in February 1979．At any other time, the corona can be seen only when special instruments are used on cameras and telescopes to shut out the glare of the sun's rays．

The corona is a brilliant, pearly white, filmy light, about as bright as the full moon．Its beautiful rays are a sensational sight during an eclipse．The corona's rays flash out in a brilliant fan that has wispy spikelike（一束束穗状） rays near the sun's north and south poles．The corona is thickest at the sun's equator．

The corona rays are made up of gases streaming outward at tremendous speeds sad reaching a temperature of more than 2 million degrees Fahrenheit．The rays of gas thin out as they reach the space around the planets．By the time the sun's corona rays reach the Earth, they are weak and invisible．

小题1:Matter on the aim can exist only in fee form of gas because of the sun's ___．

A．size

B．age

C．location

D．temperature小题2:All of the following are parts of the sun's atmosphere EXCEPT the ___．

A．corona

B．chromosphere

C．photosphere

D．core小题3:According to the passage, as the corona ra5,'s reach -die plaasts, they become ___．

A．hotter

B．clearer

C．thinner

D．stronger小题4:Which of 'die following do the paragraphs following the passage most likely discuss?

A．The remaining layers of the sun．

B．The evolution of the sun to its present form．

C．The eclipse of February 1979．

D．All the above．

瓦当图案是汉代图案中具有代表性图案之一，图案纹饰多以适合的方式构成，图案内容为（）.

A.植物叶纹

B.山水

C.云纹

D.文字

E.动物

根据《素问·阴阳应象大论》，壮火能（）

A.食气

B.生气

C.使阳气虚

D.使阴气虚

E.使津液伤