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

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統計: A(10), B(58), C(8), D(4), E(0) #938243

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#4822679


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#1633400
木材中大部分都是長期堆疊的次生木質部。
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