人类感染钩端螺旋体的主要途径是()。
A.接触污染的疫水
B.接触感染动物尿液
C.接触感染动物血液
D.接触污染的土壤
E.接触感染动物皮毛
参考答案:A
They waited at the bus stop and about five minutes later the bus they wanted along.
A.coming
B.came
C.to come
D.had come
如果某商品的价格上涨10%,其产量增加2%,则该商品的价格弹性系数为:()
A.0.2
B.5
C.10%/2%
D.2%/10%