肾盂肾炎常见的感染途径是（）
A.外伤性感染
B.血源性感染
C.上行性感染
D.下行性感染
E.多途径感染
参考答案：C
—Do you often clean your classroom?
—Yes, our classroom _____ every day.[ ]
A. clean
B. cleans
C. is cleaned
D. cleaned
图是某同学测体温时的示数，其示数为________℃。
