--What do you think of maths?--My favourite. It’s for me to study of all the subjects in school.A.more difficultB.the most difficultC.less difficultD.theleast difficult
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D解析本题的含义是我最喜欢数学，那么对于我而言所以的学科当中数学应该是最不难的，范围为三个以上事物应用最高级，little是很少最高级为least，故选D。