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【单选题】
He is widely ______ as one of our best young scientists.A.
regarded
B.
blessed
C.
concerned
D.
noted
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【简答题】Primary cells, secondary cells and cells are three types of cells and batteries. (fuel / solar)
【简答题】水体污染是指大量污染物质排入水体，超过水体的____，使水质恶化，水体及其周围的_____遭到破坏，对人体健康、生活以及生产活动等造成威胁和损失的情况。水体污染的来源主要有____、____和____。
【单选题】What is the professor's attitude toward fuel cells?
A.
He thinks that the technology is not very efficient.
B.
He is hopeful about their development in the future.
C.
He is doubtful that fuel cells will replace fossil fuels.
D.
He is discouraged because of the delays in production.
【简答题】爱护水资源主要应从______和______两方面做起． （1）防止水体污染 ①水体污染是指大______排入水体，超过水体的______使水质恶化的现象． ②污染来源：______污染、______污染、______污染． ③防止水体污染的措施 A）工业上：应用新技术、新工艺减少污染物的产生，同时对污染的水体______． B）农业上：提倡使用农家肥，合理使用______和______． C）生...
【简答题】There are 3 types of cells and batteries: primary cells, secondary cells, (fuel cells / recharging cells).
【单选题】Johnson's paper ______three processes for generating hydrogen in fuel cells.
A.
compares
B.
comparisons
C.
is compared
D.
was a comparison
【简答题】水体污染越来越严重，怎样防止水体污染呢？（3分）
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【简答题】Primary cells, secondary cells and cells are three types of cells and batteries. (fuel / solar)