【名词&注释】
不等式(inequality)、混合物(mixture)、电解水(water electrolysis)、化合反应(combination reaction)
[单选题]下列说法中错误的是（ ）
A. 电解水生成氢气和氧气，说明水是由氢气和氧气组成的
B. 氢气和氧气反应生成水，说明水是由氢，氧两种元素组成的
C. 海水，湖水是混合物，氢气燃烧生成的水是纯净物
D. 氢气燃烧生成水的反应是化合反应(combination reaction)，水电解生成氢气和氧气的反应是分解反应
查看答案&解析
举一反三：
[单选题]AWhen you look at the sky at night，the moon looks bigger than the stars． In fact，the moon is much smaller than the stars．It is much smaller than the earth． But the moon is much closer to us than any star． That is why it looks so big． If you hold a coin close．to your eye，it looks big．If you look at it across the room，it looks small．The moon moves around the earth． It makes one trip in about four weeks． The moon looks flat(扁的)to us． But it is a round ball，like the earth．People once thought the moon had fire(火) on it． They thought the fire made it bright．Now we know the moon is like a mirror( 镜子 )． It gets its light from the sun Our sunlight comes from the sun，too: What is the sun? The sun is star． The stars we can see have their own light． There are many big stars we can-t see． Their light has burned out． Others are still bright，but they are so far away that we can-t see them． The sun looks bigger and much brighter than other stars because it is the nearest of all stars． The sun and the other stars we see are very hot，but the air around us saves us from(使------免于) the heat(热量) of the sun．The sun gives us light and warmth．It makes plants grow and leaves turn green． It makes life possible on our earth．It is a life-giving star．
A. The moon looks bigger because__________ ．
B. some stars are smaller than it
C. it is between the sun and the earth
D. it is the closest to the earth
E. it is very bright
[单选题]40: He has several books on the desk，but _________ of them is on history．
A. none
B. neither
C. all
D. both
[单选题]27． When Johnny's parents saw the report， they were happy because ________．
A. Johnny was good at maths
B. Johnny loved computers
C. Johnny could jom one computer to another
D. they thought Johnny was not poor in English longer
[单选题]12．
A. offices
B. schools
C. cities
D. places
[单选题]10． Who can __________ the question?
A. look
B. hear
C. answer
D. call
[单选题]一、选择题（
每小题4分，共40
1．下列是一元一次不等式的是（ ）
A. B．C．
B.
[单选题]44．—Did you call Sara back?—I didn’t need to，_________we’ll have a meeting together tonight．
A. though
B. unless
C. because
D. if
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