答案与解析：
分析文章标题：Black holes（黑洞） lead（导致） stars（恒星） to self-destruct （自我毁灭）(Black holes trigger（引发， 引起） stars self-destruction )
直接解题：
Something destructive（破坏性的） could happen to （发生在...（的身上））a star that gets too（太） close to （接近）a black hole. Which of the following statements is NOT mentioned（提到） in the passage?
A the black hole could tear apart （撕裂）the star
B the black hole could trigger a nuclear explosion （核爆炸）in the star
C the black hole could dwindle （使缩小）its size （大小，面积）considerably（相当大地）
D the black hole could devour （吞灭， 毁灭）the star
1．C． 利用问题句及被选项中的细节信息词（方框中的结构）作为答案线索，在文章中查找答案相关句：
Scientists（科学家） have long（长期地） understood（理解， 认为） that supermasvive（特大质量的） black holes weighing（重） millions（数百万） or billions（数亿） of suns（太阳） can tear apart stars that come too close(与选项A内容一致). The black hole’s gravity（重力） pulls （一直拉）harder（强烈地） on the neatest（最近的） part of the star, an imbalance（不平衡的力量） that pulls（拉裂） the star apart over a period（期间） of minutes or hours, once（一旦） it gets close（接近的） enough（足够）.
Scientists say this uneven（不均匀的） pulling （拉力）is not the only hazard（危险） facing（面对） the star. The strain(拉力) of these unbalanced（不平衡的） forces（力量） can also trigger（引发） a nuclear explosion powerful（强大的） enough（足够） to destroy（毁灭） the star from within（里面）（与选项B内容一致）. Matthieu Brassart and Jean-Pierre Luminet of the Observatoire of the Paris in Meudon, France, carried out computer simulations of the final moments of such an unfortunate star’s life, as it veered towards a supermassive black hole.
When the star gets Close enough, the uneven forces flatten it into a pancake shape. Some previous studies had suggested this flattening would increase the density and temperature inside the star enough to trigger intense nuclear reactions that would tear it apart. But other studies had suggested that the picture would he complicated by shock waves generated during the flattening process and that not nuclear explosion should occur.
The new simulations investigated the effects of shock waves in detail, and fund that even when their effects are included, the conditions favor a nuclear explosion. “There will be an explosion of the star. It will be completely destroyed,”Brassart says. Although the explosion obliterates the star, it saves some of the start’s matter from being devoured by the black hole. The explosion is power enough to hurl much of the star’s matter out of the black holes’s reach, he says.
The devouring （吞灭，毁灭）of stars by（被） black holes （与选项D内容一致）may already have been observed, although at a much later stage. It is though that several months after the event that rips the star apart, its matter starts swirling into the hole itself. It heats up as it does so, releasing ultraviolet light and X-rays.
选项A， B和D均在文章中有相呼应得内容， 因此答案是C。
1．According to （根据）the third（第3） paragraph（段落）, researchers （研究者）differed from （与...不同， 与...意见相左）each other （彼此）in the problem（问题） of
A whether（是否） nuclear reaction （核反应）would occur（发生）
B whether the stars would increase（增加） its density（密度） and temperature（温度）
C whether shock waves （冲击波）would occur
D whether the uneven（不均匀的） forces（力量） would flatten（使变平， 夷平） the stars
2．A． 利用问题句及被选项中的细节信息词（方框中的结构）作为答案线索，在文章中查找答案相关句：
（第3段）When the star gets close enough, the uneven forces flatten it into a pancake shape. Some（一些） previous（以前的） studies（研究） had suggested（表明） this flattening（夷平） would increase（增加） the density（密度） and temperature（温度） inside（在...里面） the star enough（足够） to trigger（引发） intense（强烈的） nuclear reactions （核反应）that would tear it apart. But (考点提示词)other（其他的） studies（research的近义词） had suggested（表明） that the picture（图片，照片） would be complicated（复杂的） by shock waves （冲击波）generated（产生） during（在...期间） the flattening（夷平） process （过程）and that no nuclear explosion （核爆炸/与“核反应”词义相关）should occur（发生）（该句内容暗示可能选项A是答案）.
该段中的第2句和第3句直接与问题相关， 这两种研究的焦点在于是否会引发核爆炸， 因此A是答案。