社会主义建设的根本保证是()
抗日根据地的社会性质是()
Steve looked at the envelope and recogniz ed Jenny’s handwriting _______.
You ca n’t imagine __________ fo olishly he behaved at the party.
爱因斯坦说:“哲学可以被认为是全部科学之母。”这说明()
划分等级的标准是()