【判断题】【消耗次数：1】
所有输入系统的物质、能量都在循环中运动转化，一种有机体利用以后，转变为另一种有机体可以再利用的形式，它的结构和功能具有自动调节、自动控制的性质，使自然物质循环和能量流动保持动态平衡。
①
正确
②
错误
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相关题目
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循环经济是一种低开采、高利用、低排放、再利用的经济模式，其物质流程是（ ）。
①
再生资源—污染排放—产品
②
资源—污染排放—产品
③
资源—产品—再生资源的反馈式
④
资源—产品—污染排放
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take on
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take off
③
take up
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take in
【单选题】
Global warming threatens the _______ of the whole human race.
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summit
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superiority
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survival
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status
【单选题】
So little ____ with each other that the neighbors could not settle their difference.
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agreed did they
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did they agree
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they agree
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they did agree
【单选题】
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include
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involve
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contain
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comprise
【判断题】
判断线上的内容是否正确：It is generally considered unwise to give a child ____whatever____ he or she wants.
①
正确
②
错误
【单选题】
Before he came to New York, he had never heard a single English word（）.
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speak
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to speak
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spoke
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spoken
【单选题】
His salary as a driver is much higher than ______.
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a porter
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is a porter
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that of a porter
④
as a porter
【单选题】
We’ve missed the last bus, I’m afraid we have no _______ but to take a taxi.
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way
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choice
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possibility
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selection
【单选题】
England is an island country. _______ consists of three principal islands, and _______ climate is generally mild.
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She；her
②
She；its
③
He；his
④
It；its