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发觉RC文章的长度一行是5-6个词吗？大概60行左右吗？

Yes. My experience suggests that three out of four fit the size that you mentioned.

But a long passage (usually 3rd) is also expected.

Remeber, the difficulty is determined not only by the passage, but also by the questions.

To balance the time spent between reading and answering, a long, difficult passage will be provided by esay questions, such as the caffeine article in OG.

a lot of thx, craft! ur post really helps.