题目内容
过磷酸钙属于速效磷肥。
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水田中不宜使用硝态氮。
[音频]2. Listen again for the details and fill in the blanks with what you hear.1) I thought it had something to do with the climate. The temperature ____1______ cooler and ___2______.
[音频]2) Yeah, that’s one theory. Another idea is that they ___1______.
[音频]3) And you know, there’s even a theory that they __________ from outer space.
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