题目

According to the report，the number of animals used in experiments ________ by 30% over the years. A．was reduced  B．has been reduced C．were reduced  D．have been reduced 答案：B [时间状语over the years常与现在完成时连用；“the number of＋ 复数名词”作主语，谓语动词用单数，且reduce与the number of animals之间是动宾关系，故选B。]下列关于温度的判断，错误的是（ ）A．正常人的体温约36.5℃B．冬天，水面结冰的河水温度低于0℃C．冰箱冷冻室的温度低于0℃D．夏天，空调房内比较适宜的温度约25℃