4.What can be inferred from paragraph 3 concerning（关于、涉及到） dinosaurs?

A) They were killed off by an asteroid（小行星）.

B) They died of（死于） drastic（急剧的） climate change.

C) They were wiped off by a volcanic eruption.

D) The cause of their extinction has remained a controversial （有争议的）issue.

分析：题目就告诉我们这是一道推断题，是第三段。这是一道比较难的题目。需要大家要读懂句子，还要有推理能力：

相关的句子：“The most recent ones hardly have an effect at all,” Wignall says. He ignored（忽略、忽视） the extinction which wiped out the dinosaurs 65 million years ago, because many scientists believe it was primarily caused by the impact of an asteroid. He thinks that older volcanoes had more killing power because more recent life forms were better adapted to（更好的适应） dealing with increased levels of CO2.

主要句子是说：Wignall忽略了6千5百万年前恐龙的灭绝是否跟火山爆发有关，而其他很多科学家都认为恐龙的灭绝是受一颗小行星的影响。这就可以说明科学家们关于恐龙灭绝的原因是由争议的，因此选择D。

5. What is the main thesis of the article?（文章的主要论点是什么？）

A) Volcanic eruptions are not always deadly.

B) Older volcanic eruptions were more destructive.

C) Carbon dioxide emissions often give rise to global warming.
D) It is not easy to calculate the killing power of a volcanic eruption.

分析：通过题目分析这是一道主旨题。相当于在文章里寻找中心句。其实文章第一段就是中心：Volcanoes were more destructive in ancient history, not because they were bigger, but because the carbon dioxide they released wiped out life greater ease.

做完型填空的技巧：

我们一般认为完型填空题属于送分题，因为考题通常是从当年教材所给出的文章中挑选一篇直接出题。但需注意在考题设置时并不是原封不动将原文搬过来，而出题点和空格的设置都会有变化，这就说明平时在做题时不要背答案，而且要把文章中所有的单词尽可能都弄明白，否则送分题也有可能成为丢分题。因此，我在这里建议大家在复习时要紧扣教材，不要在从外面找不相关的题做，这样是一点帮助也没有的！

完型填空，旨在考察综合运用英文能力，考题主要从3个方面设计：1）词法结构 2）语法结构 3）前后逻辑关系。词法上考查实词（动/名/形容词）比例高于虚词（副/介词）。另外还有多义词/短语；短语的固定搭配等等。

那么，在大家做完型填空题时最好能在文章标题的指引下，先通读全文，对文章大意有个了解，接下来在细读这个环节中才会有的放矢，而不会像没头苍蝇瞎蒙乱猜。最后一遍是查读，顾名思义，边检查边读，将一些拿不定主意的最后确定下来，这样效果会最佳。