句子之间的关系多种多样，容易见到的有：并列关系、因果关系、递进关系、转折关系和相互讲解关系。
Women could and did play a part in this process of settlement. Iceland, for instance, was uninhabited, and a permanent population could only be established if women also made the journey there.
People borrowed more and more money so that they could buy these shares. Because of this, the American people started to believe that share prices could only go up further.
Astronomy is a science that deals with all the celestial1 bodies in the universe. Astronomy includes the study of planets and their satellites, comets and meteors, stars and interstellar matter, star systems and clusters.
Previously2 it was believed that due to the Archaeopteryxs underdeveloped anatomy3, it would not have been able to fly. However, research by the London Natural History Museum into its brain developed and that it had good vision and a good sense of balance all the requirements for a creature to be able to fly.
阅读时，大家可以参考段落中出现的一些信号词来判断句子与句子之间的关系，学会段落进步线索，来调整阅读速度，提升阅读水平。
1．显示相同信息的信号词：
There has been an upsurge of interest in chamber4 music. Likewise opera is receiving a boost from increased record sales.
likewise这一信号词显示了前面所提到的idea后面还要再一次出现。因此，阅读时见到如此的信号词无须放慢阅读速度。如此的信号词还包含：
and, furthermore, more, than, that, also, likewise, moreover, in addition, what is more, for instance, for example
2．显示思路转折的信号词：
Id like to go but Im too busy.
but前后是完全不一样的信息描述，它向读者显示了作者的思路在这里有了转折。阅读时，碰到如此的信号词大家需放慢阅读速度，以准确获得作者真的想要说明的意思。这种信号词还有：
although, however, on the contrary, but, in spite of, otherwise, despite, nevertheless, yet
3．显示因果关系的信号词：
As a result of the pilots strike, all flights have had to be cancelled.
All flights have had to be cancelled as a result of the pilots strike.
所有航班被取消是什么原因由于飞行员们的罢工；飞行员们的罢工致使了所有些航班不能不被取消。显示因果关系的信号词还有：
for, thus, because, for this reason, so, therefore, as, since, consequently
4．显示顺序的信号词：
Internet speeds communication between companies, among co-workers through video-conferences, and among other inpiduals. First, media companies use the Internet for online news, or to broadcast audio and video, including live radio and television programs, while inpiduals use the Internet for communication, entertainment, finding information, buying and selling goods and services. Second, the notion of distance disappears thanks to the Internet. People also enjoy instant messaging to exchange text messages or pictures in real time, with real-time video and sound. Finally, scientists and scholars use the Internet to perform research, distribute lecture notes or course materials to students, they communicate with colleagues, and can also publish papers and articles.
抓住了如此的信号词就把握住了作者叙述的顺序，也就分清了相对独立的论据。如此的信号词包含：
first, second, third, and so on, then, after, before, next, last, afterward5, finally
5．表示结论/概要的信号词：
In conclusion, I would like to say how much I have enjoyed myself today.
词组in conclusion前面所提到的一些信息将在这里被概括。读到带有如此的信号词或短语的句子时，应格外留神注意，它们总是会向大家提示有关段落的核心信息。表示结论或概要的信号词和短语还有：as a result, finally, therefore, accordingly, in short, thus, consequently, in conclusion, so, in brief, in a word
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