(经典题)(1)若a>0时,则 a ______0;若a=0,则 a ______0;若a≥0时,则 a ______0; (2)若 a >0,则a______0;若 a =0,则a______0;若 a ≥0时,则a______0.
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【简答题】结合上下文及所给首字母填空 This i 1 a classroom. It is nice a 2 bright, but it is s 3 . The doors and w 4 are clean. The desks and chairs are clean, t 5 . The walls are white. O 6 the front wall there is a b 7 . T...