正确答案: C

侏罗纪

题目：根据最新的资料，被子植物的化石最早出现于( )。

解析：C

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举一反三的答案和解析：

[单选题]豆目三个科的区分主要依据( )。

花冠

[单选题]玉米的食用部分是( )。

果实(颖果)

[单选题]在理论上，茜草、猪殃殃的叶为对生而非轮生。( )

正确

[单选题]在对应的地形图上可以看出

道路①和②可能有部分道路重合

解析：从图可以看出，①水平距离最长，不会是直线，③水平距离最短，两地之间的最高点可达375米左右，排除法，可选D.

[单选题]茎的伸长区短，根的伸长区长。( )

错误

[单选题]51

dropped

[单选题]I was ten when I first sat with my grandmother behind the cashier（收银台）in her general store. 71 I quickly learned the importance of treating customers politely and saying “thnak you.”At first I was paid in candy. 72 I worked every day after school, and during the summer and on weekends and holidays from 8 a.m. to 7 p.m. My father helped me set up a bannk account. 73

Before long, she let me sir there by myself.

[单选题]下列哪一亚门的蕨类植物其配子体为菌根式营养?( )

石松亚门