Preparatory Lesson One A. Listen to the recording and write down what you have heard on the tape. a. Numbers: 1. ________ 2. ________ 3. ________ 4. ________ 5. ________ 6. ________ 7. ________ 8. ________
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举一反三
【单选题】Seismograph was invented by ________ in the Eastern Han dynasty.