索状管胞
参考答案：
轴向成串的长矩形管胞，介于轴向管胞与轴向薄壁组织之间，细胞径壁及两端都有具缘纹孔。
Do you know how to use western cutlery (餐具)? Are you supposed to begin ______ the largest or
the smallest? [ ]
A. for
B. at
C. with
D. in
（）里的“不”与其他的“不”声调读法不同。
A.不堪
B.不愧
C.不屑
D.不胫而走
