Why do I now have to pay $50 to do a sample exam?

为什么我现在得花50大洋去做模拟试题呢？

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Try last year's exam as a sample exam when you're ready to do it.

可以做一做去年的考试题，当你们做好准备的时候。

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This course contains a full set of lecture notes, problem sets with solutions, lab handouts, and sample exam materials.

本课程包括全部的课堂讲稿，附带解答的作业， 实验讲义，和测验的范例资料。

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