生长线。
参考答案：
软体动物的介壳或厣在逐渐生长时留下的线纹。依据生长线的多少，通常可以推测动物的年龄。
I like this jacket better than that one, but it costs almost three times _____.[ ]
A. as much
B. as many
C. so much
D. so many
腰部突然剧痛，向小腹部放射，尿血，是因（）
A.肾虚
B.瘀血阻络
C.结石阻滞
D.寒邪所致
E.湿邪所致
