Here is a Cultural Literacy worksheet on the concept of a bull market. This is a half-page worksheet with three questions. The reading is one compound sentence on one line which nonetheless manages to contrast bear markets with bull markets. In other words, a succinct general introduction to the topic.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.