题目解析：
【题目翻译】：根据第5段，关于垂死太阳的内核，下列哪一项是正确的？
A：它会收缩，通过其余星星发出能量波
B：在最终收缩和死亡之前，它会发出明亮的红光
C：它将扩大到之前尺寸的数百倍
D：由于外壳的重量，它会收缩
【判定题型】：题目问的是文章中的具体细节信息，故根据题目问法可以判断本题为事实信息题。
【关键词定位】：根据关键词“inner”,我们着重来看，第五段中关于太阳内部变化的描述。首先，第4句说“The inner zone, its nuclear fires no longer burning, will begin to collapse under the influence of its own weight and will contract into a tiny hot core, dense and dim.” 太阳核心不再燃烧，在自身重力的影响下它将会开始崩塌，并收缩为一个微小而炽热核心，密度很高，颜色昏暗。这是第一层变化。接着，后文又说“A shock wave caused by the inner zone's contraction will send ripples through the dying star, pushing the stellar exterior's material farther and farther outward.”这句话说内区收缩引起的冲击波会使垂死挣扎的恒星发出涟漪，将恒星表面的物质向外推得更远。这是太阳内部的第二层变化。
【逻辑分析】：选项A所表达的意思和原文意思相同。
【选项分析】：（分析选项为什么对、为什么错）
A选项：内区收缩引起的冲击波会使垂死挣扎的恒星发出涟漪，将恒星表面的物质向外推得更远。这是太阳内部的第二层变化。这句话正好对应了A选项中说的，内核会收缩，发射出能量波。所以A选项正确。
B选项：内核会发出耀眼的红光，然后收缩，死亡。但是我们找到文中这句话“Eventually, the Sun will become a red giant star, cool and bright.”根据前文我们可知，是太阳内部和外部的共同变化，使太阳最终变成一颗又红又亮的红巨星，而并不是内核发出耀眼的红光，因为前文提到内核变得“dense and dim”，密度大且颜色昏暗，所以B选项排除。
C选项:它会膨胀数百倍。错误，因为文中说“The outer envelope will then grow rapidly, increasing, in a short interval, hundreds of times in size.”很明显，膨胀的是外层，而内核是收缩的。所以C选项与原文矛盾，故排除。
D选项：内核会因为外层的重力而收缩。错误，文中原句说“begin to collapse under the influence of its own weight”所以内核是因为自身的重力而崩塌的。故D选项不符合原文描述，排除。
Once the Sun passes into its "postnuclear" phase, it will separate effectively into two different regions: an inner zone and an outer zone. While no more hydrogen fuel will remain in the inner zone, there will be a small amount left in the outer zone. Rapidly, changes will begin to take place that will serve to tear the Sun apart. The inner zone, its nuclear fires no longer burning, will begin to collapse under the influence of its own weight and will contract into a tiny hot core, dense and dim. An opposite fate will await the outer region, a loosely held-together ball of gas. A shock wave caused by the inner zone's contraction will send ripples through the dying star, pushing the stellar exterior's material farther and farther outward. The outer envelope will then grow rapidly, increasing, in a short interval, hundreds of times in size. As it expands, it will cool down by thousands of degrees. Eventually, the Sun will become a red giant star, cool and bright. It will be so large that it will occupy the whole space that used to be the Earth's orbit and so brilliant that it would be able to be seen with the naked eye thousands of light-years away. It will exist that way for millions of years, gradually releasing the material of its outer envelope into space. Finally, nothing will be left of the gaseous exterior of the Sun; all that will remain will be the hot, white core. The Sun will have become a white dwarf star. The core will shrink, giving off the last of its energy, and the Sun will finally die.
