Almost every two weeks the students are asked to write ____ in English about everyday topics.

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• Almost every two weeks the students are asked to write ____ in English about everyday topics.
• Almost every two weeks the students are asked to write ____ in English about everyday topics.a.an eighty-word-composition b.a composition of eighty words选B,A错在哪?句子怎么翻译?
• 解方程x减4分之1加x减1分之4等于x减3分之2加x减2分之3
• m为任意自然数,请说明代数式1/4m^4-1/2m^3+1/4m^2的值一定为整数且为一完全平方数