【小题1】根据第一段When it is a solid, it can be as hard as stone. 描述,结合常识可知当水是固体时,它被叫做冰,故选D,冰。【小题2】根据第一段When it is a gas, you may not see or feel it. 描述,可知选C。【小题3】根据第二段The heat of the sun turns liquid water into ...
16. Oxygen gas is( )than air, so it can replace air.A. heavierB. lighterC. No correct answer 相关知识点: 试题来源: 解析 A. heavier 氧气比空气重,因为它的密度更大。由于氧气比空气重,所以它可以取代空气。因此,正确答案是 A. heavier。
The roads were narrow and there weren't many ring roads. Big families were crowded into small houses. Many families couldn't get enough food. Few children had the chance to receive a good education. People had little money to see a doctor. A...
... That said, water vapor is a constituent of air, so something that is truly 100% airtight is also watertight: it does not allow water molecules to pass. Is air less dense than water? Water is heavier than air because it is DENSER. This means that more water molecules are packed ...
A、spoon√ B、fork C、chopsticks 22、We can get some light from it.() [单选题] * A、sun√ B、cup C、fan 23、We can use it to wash clothes, dishes and we also can drink it.() [单选题] * A、juice B、milk C、water√ 24、We can put some flowers in it.() [单选题] * A...
和“... has found that people's mental workload will be heavier and their reaction time longer when they lie. Worse still, when the prefrontal cortex is busy with tasks related to lying, she notes, it has a harder time doing other tasks...”可知,人们掩盖谎言需要 费很多脑力。 32.A :...
A. Their planes are heavier than before. B. They want to rely less on imported oil. C. Their oil fuel harms the environment. D. They need to cut costs of electrical energy.33. What can we learn about the liquid fuel according to Vardon? A. It has as much energy as natural gas. ...
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38、used much damage to the environment and people's health.A. Too many roadsB. Too many peopleC. Too many cars6.If there were fewer cars on the city roads, _.A. the roads would be more crowdedB. the traffic would be heavierC. the air would be cleanerReading 1边学边练回顾文章,...
Fuel and air filters: Replace and keep water out of the system by using additives and maintaining a full tank of gas. A full tank will keep the fuel line from freezing. Heater and defroster: Ensure they work properly. Oil: Check for level and weight. Heavier oils congeal more at low te...