A. the economic recession was less serious B. many people earned more before C. the interest rate was very low D. real-estate developers lowered their prices 参考答案:C 答案解析:事实细节题。在最后一段谈论房产市场好转的原因时,作者说low mortgage rates offset the impact of the recession,所以说贷款利率低是主要原因。
第25题: [多项选择]传染性非典型肺炎的氧疗指征是() A. PaCO2<70mmHg B. SpO2<93% C. SpO2<95% D. PaCO2<75mmHg E. PaCO2<80mmHg 参考答案:A, B