四级练习2014.01.01
[audio]http://sound.yywz123.com/tingbbs/cet4/cet420140101.mp3[/audio]There are social and intellectual challenges, too. Leonardo da Vinci, (1)___________________________________ enjoyed every possible challenge. He was an artist and painted the well-known picture, the Mona Lisa. (2)___________________________________________________He was an inventor who invented a device to let people breathe under water. He was a scientist who learned a great deal about (3)__________________________.
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