党参的石细胞存在于________________。
参考答案：木拴层
Mary’s parents hope she will become an outstanding pianist and they don’t ________her to go out with her friends even on weekends.
A．agree
B．permit
C．approve
D．suggest
若科目编码级次定义为3-2-1，则下列不正确的科目编码描述是（）。
A.102011
B.102101
C.102110
D.1020101
