Answer: Both passages are written for textbooks so C is youre
answer.
Explanation: this is correct
I would say a book. But I’m not sure. Sorry this isn’t much help!
Progressive verbs I believe end in "-ing" because they are actions that are still in the process of being performed. So, the answer is C because of the word "reading"
The answer is D because the author wants the reader to understand the central message of the passage.