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Table 3 The difficulty distribution of question bank

From: Research on English teaching system based on artificial intelligence and WBIETS wireless network system

Questions Easily
0.8 ≤ d ≤ 1
Secondary
0.6 ≤ d < 0.8
Difficult
0.3 ≤ d < 0.6
Hard
d < 0.3
Choice question 24 72 47 17
Completion 20 55 38 12
Noun interpretation 19 48 23 10
Short answer questions 11 30 18 7