When you write assignments, you have to do research, which means reading widely, using【D1】________sources, including, nowadays,

When you write assignments, you have to do research, which means reading widely, using a variety of sources, including, nowadays, the Internet. It does not mean just checking out Wikipedia and quote it word for word.
    When students did all their research in the library, it was easy to find authoritative sources because they could see the difference between a popular magazine and an academic journal. On the web, you need to check who the writer is, who he/she is writing for, and whether the article provides just an overview or detailed research.
You need to validate all ’ facts’ on the web because many writers of web articles are biased in favour of or against their topic. For example, people are often ethnocentric and think their own culture is always right. Sometimes they state their bias. They say clearly ’ In my opinion…’. Sometimes, though they are not so direct, they use extreme words, particularly adjectives, like stupid and disgusting, or brilliant and delicious. Sometimes, they only imply things—in other words, you have to work out the opinion of the writer from the kind of evidence they give. So you must critically evaluate any information you read on a website. Keep thinking: what does the writer think about this point?