题目

 The stones are so heavy. How ____ they _____to the top of the building without modern machines?    A. do; lift            B. did; lift           C. were; lifted              D. were; lift 答案：C13．下列现象可能会导致全身或局部组织液减少的是（　　）A．长期蛋白质摄入不足B．局部皮肤接触过敏原C．淋巴管中有丝虫寄生D．体内产生大量抗利尿激素的抗体