教程音频难度分为4个等级:
B-Elementary 初级
C-Intermediate 中级
D-Upper Intermediate 中高级
E-Advance 高级
B
1,2,14,16,17,20,23,24,26,27,31,33,36,39,40,42,43,44,66,73,76,79,81,84,85,87,88,92,101,103,110,111,113,115,119,122,125,127,130,131,134,135,138,139,140,142,145,149,150,154,157,162,167,169,172,174,176,177,180,183,184,185,188,190,191,195,197,200,202,203,206,209,211,213,216,219,220,223,228,230,232,233,235,236,238,240,241,244,245,247,248,250,253,254,256,258,259,261,262,263,271,275,276,281,285,288,294,296,297,299,301,303,305,307,308,310,311,314,323,326,327,332,335,338,344,348,350,355,358,365
C
3,4,5,6,7,8,9,10,11,12,13,15,19,21,22,28,30,32,35,37,38,41,45,48,49,50,51,52,53,54,55,56,57,58,60,62,63,65,67,69,71,72,75,77,82,83,86,89,95,96,98,100,105,106,109,112,114,118,123,126,133,141,143,147,152,155,158,159,161,166,199,173,179,181,182,187,189,194,196,201,204,207,210,214,215,217,221,226,229,231,237,239,243,246,251,257,260,264,265,267,270,272,273,274,277,278,280,283,286,287,289,291,292,295,298,300,302,304,309,312,313,316,318,319,321,322,325,328,329,331,334,336,339,345,349,351,356,357,359,361, 363, 364
D
18,25,34,46,68,74,80,90,91,93,97,107,108,117,120,124,128,132,137,146,148,153,160,163,165,170,175,178,186,192,193,198,205,208,212,218,224,227,234,242,249,252,266,268,269,279,282,284,290,306,315,320,324,330,333,340,341,342,343,352,354,360,362
E
29,47,59,78,94,99,102,104,116,121,129,136,144,151,164,168,171,222,225,255,293,317,337,346,353
F
70,156
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