正确答案: D

薄壁组织

题目：次生分生组织可由( )直接转变而来。

解析：D

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举一反三的答案和解析：

[单选题]听第8段材料，回答第 10～12 题。第10题：How long has the man been in London?

A few years.

[单选题]菊科的雄蕊是( )。

聚药雄蕊

[单选题]

experiences

[单选题]It was a nice house, but _______ too small for a family of live.

rather

[单选题]44_______

until

[单选题]为防止甲型H1N1病毒在人群中的传播，有人建议接种人流感疫苗，接种人流感疫苗能够预防甲型H1N1流感的条件之一是：甲型H1N1病毒和人流感病毒具有相同的

抗原决定簇

解析：【解析】甲型H1N1病毒和人流感病毒具有相同的抗原决定簇，所以接种人流感疫苗能够预防甲型H1N1流感。故选C。

[单选题]C Too much TV-watching can harm children’s ability to learn and even reduce their chances of getting a college degree,new studies suggest in the latest effort to examine the effects of television on children.One of the studies looked at nearly 400northern California third-graders.Those with TVs in their bedrooms scored about eight points lower on math and language arts tests than children without bedroom TVs.

have watched a lot of TV