The scanning strategies of worms and the propagation speed are analyzed.
对蠕虫扫描策略及其传播效率进行了深入分析；
Traditional reading tests pay too much attention to careful reading; while expeditious reading strategies, such as skimming and scanning, are not given adequate consideration.
但是在阅读测试领域仍然存在许多问题，传统阅读测试极其重视仔细阅读，而对快速阅读策略，如略读和寻读则不够重视。
Less study has been performed on three reading strategies including prediction, word-attack skills, skimming and scanning.
而对中职生英语阅读策略中的预测、词汇、 略读与寻读三类策略研究的更少。
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