正确答案: A

石细胞

题目：纹孔道存在于下述哪类细胞壁上?( )

解析：A

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举一反三的答案和解析：

[单选题]The word“shoot”underlined in the 2nd passage probably means“ ”.

move quickly

[单选题]中轴胎座类型的子房一定是( )。

多心皮多室

[单选题]桔梗科花冠常为( )，如风铃草。

钟状

[单选题]内稃相当于( )。

小苞片

[单选题]下列关于核酸的叙述中，正确的是

双链DNA分子中嘌呤数等于嘧啶数

[单选题]回答 64 ~ 67 题：A volcanlc ctuption in iceland has sent ash zcross northern Europe .Airlines have Stopped or changed the flights across the Allantic Ocean , leaving hundrede of passengets stuck in aipports.Grimsvotn is one of the largest and most active volcadoes in Europe. What makes Grimsvom different is that it lies under a huge glacier(冰川) of ice up to 12 maters thick. The hot volcano heats up the ice above it, which then forms a layer(层)of water between the glacier and the volcano This layer of water puts pressure on the volcano, keeping it stable, As the water flows out from under the glacier, the pressure lifts. The lava(岩浆) from the volcam then comes up to the surface. This is exactly what happened today.

It is below ice.

[单选题]三、（9分，每小题3分）阅读下面的文言文，完成8-10题

讲章句、课文字而已 课:抄写

[单选题]How did the calf feel about the mother elephant’s roaring?

It was a great comfort.

[单选题]杨柳科具有的胎座类型是( )。

侧膜胎座