正确答案: A

正确

题目：从蕨类植物开始有了真正的根。( )

解析：A

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举一反三的答案和解析：

[单选题]I had great difficulty________the suitable food on the menu in that restaurant.

finding

解析：

have difficulty(in)doing sth.做某事有困难。

[单选题]EHumans are naturally drawn to other life forms and the worlds outside of our own。We take delight in the existence of creatures and even whole societies Beyond our everyday lives.

the general existence of the sense of curiosity

[单选题]When did Lisa become conscious again?

After she was back on the platform.

解析：【解析】细节理解题。由倒数第三段的It was hard to lift her. She was just out. But he managed to raise her the four feet to the platform. so that bystanders could hold her by the grins and drag her away from the edge. That was where Lisa briefly regained consciousness可知。

[单选题]听第10段材料，回答第17至20题。17. What is the talk mainly about?

The plan for the day.