Why does the author call lichens pioneers?
A、Because they developed so early in the history of the planet.
B、Because of their primitive structure.
C、Because they prepare soil for other plants.
D、Because they were the first plants to live in Antarctica.
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_______ her pen in ink, when she heard the tramping of little feet along the hall, and then a pounding at her door.
A、No sooner has she dipped
B、Scarcely had she dipped
C、As soon as she had dipped
D、Hardly she has dipped
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B、America is a country in which the concept of children is more emphasized than any other countries in the world.
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D、Adults should learn from their children because they are more energetic.
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