10分钟分辨率为800×600、24位真彩色、每秒30帧的视频，其不压缩的数据量是()。

We cannot develop speaking skills unless we also develop _______ skills.readingC. writingD. understanding

A.listening
B.

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The aim of the ______ is to get the learners to perceive the structure --- its form. and meaning --- in both speech and writing and to take it into short-term memory.explanationC. presentationD. practice

A.isolation
B.

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