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【单选题】
It is well known that a person learns many things by making mistakes and them.
A.
to correct
B.
correct
C.
correcting
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【单选题】In paragraph 1 sentence 2,“these building blocks”refer to______.
A.
machine elements
B.
devices, apparatus, and machinery
C.
devices, apparatus
D.
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the brake
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【单选题】所谓“循环经济”，是以产品清洁生产、资源循环利用和废物高效回收为特征的生态经济发展形态。其出现是与人类面临的人口膨胀、资源匮乏、环境污染等严峻问题相关联的。循环经济要体现“减量化、再利用、再循环”的原则。从这点出发，焚烧发电无疑是目前国际通用、也最有效的处理方式。据检测数据显示，焚烧可减少垃圾量80%～90%。经过焚烧，垃圾中的细菌、病毒比其他处理方式消灭得更彻底，各种恶臭气体被高温分解、对周边环...
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