题目

—Excuse me, is the supermarket far from here?— No, it's about ________. A . 7 minutes walk B . 7 minute walk C . 7 minutes' walk D . 7 minute's walk 答案：C10、下列实验操作正确的是（　　）A、液体过滤B、取用粉状药品C、加热KMnO4制氧气D、制取CO2