The selection of the reading materials and the difficulty level of the materials are checked in detail.
对阅读材料的选择和难度做了详细的分析。
The reading passages which follow are all of an average level of difficulty for your stage of instruction.
接下来的阅读段落，都是参考于你所处的教学阶段的平均难度。
This series is based on 12 news articles covering a range of topics. Each news article is level-specific in terms of reading difficulty.
《时事英语》课程包含12篇不同主题不同难度的时事评论性文章。
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