3. The tissue makes up most of the wood of a tree is _____.(A) primary xylem (B) secondary xylem (C)

問題詳情

3. The tissue makes up most of the wood of a tree is _____.
(A) primary xylem
(B) secondary xylem
(C) primary phloem
(D) secondary phloem
(E) cork

答案：B
難度：困難0.3
統計：A(5),B(6),C(6),D(0),E(0)