致密斑
参考答案：
为远端小管靠近肾小体侧的上皮细胞形成的椭圆形斑
新生儿的视觉的清晰范围为（）
A.5～10cm
B.10～15cm
C.15～20cm
D.20～30cm
E.30～60cm
Living in the central Australia desert has its problem, _____ obtaining fresh water isn’t the least.
A．for which
B．to which
C．of which
D．in which
