21．Experiments of this kind in both the U.S. and Europe well before the Second World War.
Answer key
D
Experiments of this kind in b…——2011 高考英语第 21 题答案解析
2011_北京 Paper
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difficulty
Differentiating
2011_北京 Paper
21．Experiments of this kind in both the U.S. and Europe well before the Second World War.
D