在跨考考研英语二中，答案如下：
1. 问题：The author's main purpose in writing this passage is to ______.
答案：analyze the reasons behind the increasing popularity of online learning.
2. 问题：According to the passage, which of the following is NOT a benefit of online learning?
答案：It significantly reduces the cost of transportation.
3. 问题：The phrase "a sea change" in line 4 is closest in meaning to ______.
答案：a major change.
4. 问题：Which of the following is mentioned as a challenge in implementing online learning systems?
答案：Ensuring equal access to technology for all students.
5. 问题：In the last paragraph, the author suggests that ______.
答案：further research is needed to fully understand the long-term effects of online learning.
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