80 RC Passage 2
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Comments

I thought this passage's purpose is illuminate because I couldn't find any pro voice in the passage, so I thought it introduce new knowledge of other factors to explain GM clearly. Where did you catch the didactic attitude and advocate purpose?

I'd say that passage puts it most plainly in line 23. Whenever you have an author telling you what you should think about a subject, you can appropriately call such a passage advocative.

Also I'm wondering How degree I have to apply for the READ ACTIVELY and SPAM. It could be that I couldn't adjust it well. sometimes I read too detailed for catching them above. To save time I didn't do it. At that moment I missed questions. What should I do?

You've answered your question!
There's no utility in saving time; your job is to answer questions right, not fast.
Continued practice makes you good at the work. Being good at the work is all that matters.