(单选题)1: It issued an import warning on Chinese frozen spinach using the ( ) of higher-than-required amounts of pesticide residue. 日本发出了针对中国冻菠菜的进口警告，借口是杀虫剂的残留物高于要求的标准。。
A: preface
B: pretext
C: prepare
D: prefere
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