正确答案: C

坡向

题目：下列生态因子中，对生物起间接作用的是( )

解析：C

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举一反三的答案和解析：

[单选题]陶渊明生活的朝代是（ ）

东晋

[单选题]Which of the following statements in supported by the passage?

It is sure that the energy sent out by the sun will drop when more sun spots appear．

解析：参见第四自然段“…as the size and number of sun spots increased，the over-all energy sent out by the sun would：decrease”可得知C正确。