皮皮学，免费搜题
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【单选题】
听力原文：M: I haven't seen the Greens for years. Do they still have just two boys and a girl? W: No, they had twin girls the year before. Q: How many children do the Greens have now? (13)A.
Two boys and a girl.
B.
Four boys and a girl.
C.
Two boys and three girls.
D.
Two boys and two girls.
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】好氧堆肥和厌氧堆肥的区别：()
A.
好氧堆肥温度高，厌氧堆肥温度低;
B.
好氧堆肥基质分解比较彻底，厌氧堆肥分解不够充分;
C.
好氧堆肥堆制周期短，厌氧堆肥堆制周期长;
D.
好氧堆肥异味小，厌氧堆肥异味浓烈;