化学与人类生活、社会可持续发展密切相关。下列有关说法正确的是_爱下问搜题

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问题选择题

化学与人类生活、社会可持续发展密切相关。下列有关说法正确的是

①高空臭氧层吸收太阳紫外线，保护地球生物；低空臭氧是污染气体，对人体有危害

②374℃、2.2×10⁴kPa时，水与CO₂发生“水热反应”生成有机物，该反应是放热反应

③PM2.5表示每立方米空气中直径小于或等于2.5微米的颗粒物的含量，PM2.5值越高，大气污染越严重

④易降解的生物农药更适合于在未来有害生物综合治理中的应用

⑤过度使用尿素[CO(NH₂)₂]会使土壤碱化，可用石灰加以改良

A．①②⑤

B．①③④

C．②④⑤

D．①③⑤

答案

答案：B

题目分析：水与CO₂反应生成有机物，是葡萄糖氧化的逆反应。葡萄糖氧化是放热反应，所以水与CO₂反应是吸热反应，石灰是碱性物质，不能改良土壤碱化。所以正确的是①③④。答案选B。

点评：这类习题经常作为化学高考的第一道题。难度比较小，但是考查的知识面比较广。

阅读理解

You can buy chewing gum in nearly every country of the world. ① But it wasn’t always like that.[

The American Indians were the first people to chew gum. This gum came from a special tree that grew on their land. In 1848, a sailor called John Curtis began selling it. He was the first person to sell chewing gum. The gum he sold cost just a few cents for two pieces. It became popular very quickly even though it was very hard to chew. ② Nowadays, other things are added to the gum to make it soft and sweet.

By 1890, there were hundreds of different chewing gums. The most famous name in chewing gum, however, is probably William Wrigley. He spent a lot of money in advertising and even sent free pieces of gum to children on their birthdays. ③ He also said that chewing gum helped people work better and that it stopped people from feeling tired.

Although today many millions of people chew gum, not everyone thinks it is a good thing to do. Many people think it is dirty. The Singapore government does not allow people to buy chewing gum. One reason for this is that when some people have chewed all the taste out of their piece of gum, they take it out of their mouths and put it on to the backs of seats or other places.

小题1:请将①处翻译成汉语。________________________

小题2:请根据②处内容完成下面句子。（每空一词）

People make chewing gum soft and sweet _________something to it.

小题3:把③处改为直接引语。（每空一词）

He also said“, Chewing gum______ people work better and it ______people from feeling tired.”

判断题

事故蒸发器投用过程中，要先全开蒸汽阀及蒸汽凝液阀，再打开乙烯入口阀，控制好出口温度和压力。