“三山夹两盆”是哪个省区的地形特征？[ ]
A．西藏
B．新疆
C．四川
答案：B
___________ is the seventh month of the year. [ ]
A. June
B. July
C. August
钩端螺旋体入侵人体的途径主要是
A．呼吸道飞沫
B．输血传播
C．皮肤黏膜破损处入侵
D．粪-口途径
E．蜱咬伤
