问题 选择题

工业生产苯乙烯是利用乙苯的脱氢反应:

下列说法错误的是

A.该反应中生成物的总能量高于反应物

B.增大压强反应物活化分子百分数不变

C.升高温度可以提高原料乙苯的转化率

D.不断分离出苯乙烯可加快反应速率

答案

答案:D

题目分析:A、正确,生成物的总能量=反应物的总能量+吸收的能量;B、正确,增大压强,相当于增大了浓度,活化分子数目增大,没有改变活化分子百分数。C、正确,本反应是吸热反应,升高温度平衡正向移动,可以提高原料乙苯的转化率;D、不正确,不断分离出苯乙烯,生成物浓度降低,反应速率降低。选D。

选择题
阅读理解

As the new semester begins,millions of college students across the country are trying hard to remember how best to write a paper-or,more likely,how best to delay that paper.

Procrastination is the thief of time and a lot of students suffer from it.They can spend whole days in the library doing nothing but staring into space,eating snacks,surfing the Internet,watching videos and looking at their pretty peers sitting around them,who,most likely,are doing nothing either.

Paralyzed by their habit to procrastinate,they write micro blogs about their fears,asking their online friends if they sometimes have the same issue.But this does nothing to solve their problems.

According to a recent report by the BBC,95 percent of us procrastinate at some point and 20 percent of the world’s population are procrastinators,complicating their lives with their continual delaying of tasks.

Procrastinators like to find excuses to justify their behavior,but BBC columnist Rowan Pelling says they are all wrong.Many procrastinators tell themselves they are perfectionists who work best under pressure.Pelling says this is nonsense,as work done at the last minute is more likely to have mistakes than work done on time.

She says the behavior of procrastinators often makes them feel flustered and ashamed,inconveniences others,and annoys loved ones.

Fortunately,social seientists have made tireless efforts to understand this behavioral shortcoming and offer strategies to control it.Piers Steel,a Canadian social scientist and author of The Procrastination Equation,believes humankind is“designed”to procrastinate.Nevertheless,he suggests a couple of good ways to get through the task at hand.

The first one is obvious:Break the task down into small pieces and work your way through them methodically.

The second is clever:Give a trusted friend a sum of money and tell them that if you don’t complete the task you have undertaken by a specific time,they can keep it or donate it to a cause you hate.

小题1:What does the underlined word“Procrastination” in the second paragraph refer to?

A.A bad habit of putting work or tasks off.

B.A thief who steals time and money in college.

C.A college student who learns nothing.

D.A study way of doing nothing in the library.小题2:Which of the following statements is true according to the text?

A.College students can have their papers written if they delay them.

B.Many students don’t know what to do in the library.

C.Students can’t solve their procrastination by writing micro blogs.

D.20%of the procrastinators make their life complicated.小题3:According to Rowan Pelling,we can learn that procrastinators .

A.can find reasonable excuses for their behavior

B.are able to work best under pressure

C.are more likely to avoid mistakes at work[]

D.may upset themselves and their loved ones more frequently小题4:Which of the following may Piers Steel support?

A.Human beings are not born to be procrastinators.

B.Complete your tasks or work step by step.

C.Give your trusted friend money and ask him to help you finish your tasks.

D.You can’t control procrastination but you can avoid it.小题5:What’she best title of the text?

A.Who steals my time?

B.The solutions to procrastination

C.I’ll do it tomorrow,I swear!

D.Don’t do nothing!