题目

I'd like to buy a house — modern, comfortable, and ____ in a quiet neighborhood. A. above all    B. in all          C. after all        D. at all 答案：A长为4m的梯子搭在墙上与地面成45°角，作业时调整为60°角（如图所示），则梯子的顶端沿墙面升高了    m．