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发挥学生的积极性和主动性非常重要，现在的教育应该柞行发现学习的方法，来代替传统的讲授。

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A few simple (modify)（）to this work would greatly improve it.

桑螵蛸

A. 补肾助阳，固精缩尿
B. 收敛止血，固精止带，制酸止痛，收湿敛疮
C. 涩肠，敛肺，下气，利咽
D. 敛肺滋肾，生津敛汗，涩精止泻，宁心安神
E. 补益肝肾，收敛固涩

A-proof of death H-release certificateB-bodily harm I-copyright lawC-key witness J-sum of claimD-right of author K-house arrestE-reject an appeal L-permanent populationF-attainder M-limitation in lawG-letter of accusation N-black marketO-process of law （）释放证书（）驳回上诉

[听力原文] 11-15(11) In the 1870s, people began to ride a new kind of bike called the Ordinary． The Ordinary，however，was an unusual bike．(12) For one thing its wheelswere of different sizes．(13) The front wheel was fourto five feet high，while the back wheel was about a footand a half high．Because its front wheel was so large,(14) the new bike was faster and quieter．What ismore，the rider’s body was not bumped around as muchon the Ordinary．But the Ordinary wasn’t comfortablefor anyone．(15) It was so high that getting on and offwas very difficult. As years passed，other ways ofmaking a fast, light bicycle were discovered．And bythe end of the 1900s, the Ordinary was just about gone． 11（）