正确答案: A

正确

题目：电镜下质膜呈现三层结构。( )

解析：A

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举一反三的答案和解析：

[单选题]Which of the following might be the best title of the passage?

Solar Storms: Human Activities to Be Troubled

解析：通读全文可知整篇文章讨论的是太阳运动所可能会带来的困扰

[单选题]菊科植物花序外包被着的绿色部分是副萼。( )

错误

[单选题]给旱区送水的消防车停于水平面，在缓缓放水的过程中，若车胎不漏气，胎内气体温度不变，不计分子势能，则胎内气体

从外界吸热

[单选题]Progress so far very good and we are sure that the work will be finished on time.

has been

[单选题]

writing