Some words in the reading passage help explain how ideas are connected together.
To add more information or to clarify a point: moreover, furthermore, indeed, in addition, similarly, in fact
To present the opposite view: although, though, despite, in spite of, nonetheless, whilst
To give an example: such as, for instance, to illustrate this
To draw a conclusion: therefore, consequently, thus, as a result, hence
The Official Cambridge Guide to IELTS for Academic and General Training p.64