正确答案: BE

组成分子相连接的横壁形成穿孔 细胞成熟过程中次生壁不均匀加厚

题目：下列哪些特化现象不属于筛管所具有?( )

解析：BE

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举一反三的答案和解析：

[单选题]蒲公英的( )上有一伞状结构，适于风力传播。

果实

[单选题]中国近现代史上有许多著名的战役，如：①台儿庄战役，②平型关大捷，③辽沈战役，④淮海战役，⑤武汉会战等。上述战役中，发生在抗日战争时期的有( )。

①②⑤

[单选题]“几个小时前我还是皇家警察，但现在我已是一名堂堂正正的香港警察了。”该警察说这句话的背景是

中华人民共和国香港特别行政区成立

解析：【解析】皇家警察是英国由英国女皇授予香港警察的。名称的改变”体现了香港刚刚回归，原来的部分香港皇家警察变成了中国香港特别行政区的警察。

[单选题]Why did the woman leave her hometown?

To find a job.

[单选题]A It was a village in India . The people were poor. However , they were not unhappy .After all, their forefathers had lived in the same way for centuries.Then one day. Some visitors from the city arrived. The told the villagers there were some people elsewhere who liked to eat frog’s legs . However , they did not have enough frogs of their own ,and so they wanted to buy frogs from other place.

were poor but somewhat content

[单选题]We can infer from the passage that in England （ ）

many young people don’t like theatre

[单选题]The author of the text mainly______.

argues against the air-courier travel