正确答案: A

正确

题目：纺锤原始细胞经平周分裂后可形成次生木质部和次生韧皮部。( )

解析：A

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举一反三的答案和解析：

[单选题]What is the woman\'s seat number?

7A．

解析：暂无答案

[单选题]The majority of people in the town strongly the plan to build a playground for children.

support

[单选题]The author’s purpose of writing this article is to tell people _________.

how to act politely and properly in business

[单选题]Up to now, the program ________ thousands of children who would otherwise have died.

has saved

解析：本题考查动词时态的用法。句意应为“截止到现在，这个项目已经挽救了成千上万的本来会死去的孩子的生命。”up to now是现在完成时态的标志，所以空格处使用现在完成时态。

[单选题]下列各句中，没有错别字的一项是

横滨市乒赛落下帷幕，中国队囊括了单项金银牌，国人振奋之余心生感慨：我们的表现固然可以赢得世界敬佩，却易导致球赛精彩不再。

[单选题]All the dishes in this menu, （ ） otherwise stated, will serve two to three people.

unless

解析：考查状语引导词(unless)。全句意思是：在这份菜单上的所有菜，除非另外说明，会给二到三个人食用。

[单选题]Bob would have helped us yesterday ,but he .

was busy busy

[单选题]南瓜和葡萄的卷须都是茎卷须。( )

正确