A. They felt somewhat helpless about it. B. They accused those responsible for it. C. They pooled their efforts to help solve it. D. They demanded a thorough investigation. 参考答案:C 答案解析:细节再现。第1段段第一句指出：在Vrain School District出现预算短缺时，当地居民都在协力相助。“pitch in to help”与“pool one's efforts”都是“共同
第37题: [单项选择]下列各项，对确诊冠心病最有价值的辅助检查是 A. X线检查显示左室增大 B. 心电图检查有ST段及T波的改变 C. 选择性冠状动脉造影 D. 心电图二级梯双倍运动试验阳性 E. 超声心动图显示左室后壁运动减弱 参考答案:C
第38题: [单项选择]—Is Mrs White in the office —Yes, _ _____she is on duty, she must be there. A. since B. until C. for D. if 参考答案:A 答案解析:[考点] 词语辨析
[解析] since 表示“因为……，既然……”，比because 意味稍弱，表示的原因大多是彼此已经知道的。since 所引导的从句多出现在句首。
