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【简答题】
(7分)水是重要的资源，我们应了解水的有关知识。 (1)A中水发生了 （填“物理”或“化学”）变化。 (2)B是电解水的实验装置，写出该反应的文字表达式是 ；用 检验b试管中产生的气体。 (3) 有同学利用所学的知识将浑浊的坑水用C图所示的简易净水器进行净化，其中小卵石、的作用是 。 (4)硬水给生活和生产带来很多麻烦，生活中可用 来区分硬水和软水，常用 的方法来降低水的硬度。 （5）地球上的总储水量虽然很大，但淡水很少，爱护水资源是每个公民的责任和义务。下列行为属于节约用水的是 (填序号) A.公共场所不用随手关水龙头 B．洗的浇花 C.不间断放水刷牙
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举一反三
【单选题】I am sorry it’s _________ my power to make a final decision on the project. A. over B. above C. off D. beyond
A.
B.
C.
D.
D
【简答题】尊重法律权威有什么意义?
【单选题】All the task ____ ahead of time, they decided to go on holiday for a week. A. had been fulfilled B. were fulfilled C. having been fulfilled D. been fulfilled
A.
选择1
B.
选择2
C.
选择3
D.
选择4
【简答题】Jimmy has lived in Tokyo all of his life where he owns a house. He came to the UK on 1 May YEAR having sold his house in Tokyo the month before. He decided to buy a flat in London which he used as his...
【简答题】Having lived in the house for so long, we found our kitchen looked old. We decided it was time to 1 the kitchen, and my husband and I were discussing 2 colors. The children, sitting nearby, suddenly a...
【多选题】尊重法律权威性的意义有
A.
时建设法治国家的前提条件
B.
对于推进国家治理体系和治理能力现代化、实现国家的长治久安极为重要
C.
实现人民意志、维护人民利益、保障人民权利的基本途径
D.
维护个人合法权益的根本保障
【单选题】I am sorry it’s _______ my power to make a final decision on the project.
A.
over
B.
above
C.
off
D.
beyond
【单选题】Water is as _______ to fish as air is to man.
A.
obvious
B.
basic
C.
indispensable
D.
constant
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