问题 填空题

如图,甲、乙两支相同的温度计,其中甲的玻璃泡上包着湿棉花,乙是干燥的,我们发现   (填“甲”或“乙”)温度计的示数要低一些,这说明                  .空气中水蒸气的含量越少,水的蒸发就越快,两支温度计的示数差就越   ,有一种干湿温度计就是用这个原理制成的,可以用来显示空气中的湿度.炎热的夏天,当你走在晒得发烫的柏油路上时,刚巧来了一辆洒水车,洒湿了路面.这时你会感到更加闷热,对产生这种感觉的主要原因,小明认为是由于洒水车中的水经过曝晒,温度很高,而小红则认为是由于洒水后空气的湿度增加,身上的汗较难蒸发.那么,你认为是    的看法对.

答案

甲;液体汽化要吸引热量;大;小红.

题目分析:物体由液态变为气态的过程叫汽化,汽化吸热,有致冷作用.

解:甲温度的玻璃泡上是湿的,水汽化时吸热,使温度计的示数更低;

当空气中的水蒸气含量越少时,湿泡温度计上的水分蒸发越快,温度下降的越快,干、湿温度计的示数差越大;

炎热的夏天,被晒得发烫的柏油路温度很高,洒上水后,加快了水的蒸发,蒸发的水蒸气再液化,变成水,自然就要放热,热量都被散发到周围的空气里,使周围空气湿度增加,防止了一部分汗液蒸发.故小红的看法是正确的.

故答案是:甲;液体汽化要吸引热量;大;小红.

点评:本题主要考查学生对:蒸发吸热在生活中的应用的了解和掌握,是一道基础题.

阅读理解
A man walked into a restaurant. The restaurant advertised it had the   1   menu in the world. The manager was very proud of being able to provide any dish, no matter how   2   it was.
At the bottom of the   3  , there was a notice that said, “If you do not see the dish you need on this menu, please tell us and we will add it to the menu right away.”
The man   4   the menu and decided to make sure if it was true. He would order   5    that was very unusual.
When a waiter came up to take his order, he said, “You say you can serve any dish, even if it’s not on your longest menu in the world.”
“That is correct, sir. We are able to meet everyone’s requirements.”
“Well,” the man said, “bring me a sandwich with two elephant ears.   6  , not African.”
The waiter wrote down in his paper: Two Indian elephant ears on toast.
“Very good, sir,” he said. “That shouldn’t   7   long.”
The waiter walked away quickly.
The man was very surprised and rather disappointed.
Then he smiled   8  the waiter returned with a very unhappy look on his face.
“Ah!” the man said. “You can’t  9  it to me, can you?”
The waiter made an apology (道歉).
“I’m very sorry, sir, and this is the   10  embarrassing,”(困窘 ) he said, “but I’m afraid we can’t because we’ve run out of bread.”
小题1:
A.biggestB.thickestC.heaviestD.longest
小题2:
A.unfairB.unusualC.beautifulD.important
小题3:
A.menuB.dishC.restaurantD.table
小题4:
A.looked forB.took outC.looked atD.picked up
小题5:
A.anythingB.nothingC.everythingD.something
小题6:
A.AmericanB.IndianC.CanadianD.Australian
小题7:
A.payB.costC. takeD.spend
小题8:
A.asB.and C.soD.though
小题9:
A.catchB.takeC.fetchD.bring
小题10:
A.leastB.mostC.lessD.more
问答题