正确答案: D

水通电分解

题目：下列变化能证明分子可以再分的是【】

解析：D

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举一反三的答案和解析：

[单选题]国土面积居世界前三位的国家依次是：

俄罗斯、加拿大、中国

[单选题]25． Americans have ．_________at dinner．

coffee， tea and wine

解析：25．c【解析】文章最后两句给出了明确的答案。

[单选题]放在凸透镜前10厘米高的蜡烛，通过凸透镜折射以后成的像高15厘米，则物距的范围在（ ）

大于焦距，小于2倍焦距

[单选题]（ ）Some students prefer yellow rulers or erasers when they study for exams because yellow is the color of __________.

wisdom

[单选题]5． Please cut _________ the meat and let's make dumplings．

up

[单选题]Sally is a student of Grade Eight． She always works hard (11 ) her lessons． English is her favorite (12 )． She thinks that it is as (13 ) as Chinese， but it's more difficult (14 ) than Chinese． For example， a lot of English words and expressions are hard to remember．She often carries her walkman with her， and she spends time (15 ) English tapes every day．It (16 )her listening better and better．Sally is (17 ) student in her class． She often helps her classmates (18 ) their lessons after (19 ) her homework． Most of her classmates like t0 (20 ) her when they have ques- tions． They think she is smart and outgoing．

at

[单选题]土壤环境质量评价指标中单项评价指标有（ ）。

重金属及有毒非金属物质的含量