题目内容

植物营养的奠基人是德国土壤学家李比希。

A. 对
B. 错

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肥料施得越多,种类越多,植物产量就越高。

A. 对
B. 错

植物必需营养元素的种类及其判定条件有哪些?

根外营养的特点?

When ________ to the party, he was very happy and accepted it.

A. inviting
B. to be invited
C. invited
D. having invited

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