正确答案: C

纺锤状原始细胞

题目：双子叶植物茎内的次生木质部由( )分裂、生长和分化而成。

解析：C

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举一反三的答案和解析：

[单选题]CPacing and Pausing

Betty did not take her turn.

[单选题]---Sorry, Professor Smith. I didn't finish the assignment yesterday.---Oh, you_______ have done it as yesterday was the deadline.

should

解析：

此处表示和过去事实相反的情况，应该用should + have + 过去分词。本来应该做，而未做

[单选题]卷柏的根托为外起源，可视为无叶的枝。( )

正确