题目

— How are things going, Mr. White?— Well, they have set out to deal with the present situation ________ they think deserves their immediate attention. A . what B . where C . when D . which 答案：D课间，小聪拿着老师的等腰直角三角板玩，不小心掉到两墙之间（如图所示），∠ACB=90°，AC=BC，从三角板的刻度可知AB=20cm，小聪很快就知道了砌墙砖块的厚度（每块砖的厚度相等）为________cm．