问题 填空题

下面列出了几组物质,请将物质的合适组号填写在空格上。

同位素____________,同系物_____________,同分异构体____________。

①金刚石与“足球烯”C60; ②D与T; ③16O、17O和18O; ④氧气(O2)与臭氧(O3);

⑤CH4和CH3CH2CH3; ⑥乙醇(CH3CH2OH)和甲醚(CH3OCH3);

; ⑧

答案

②③;⑤⑦;⑥⑧

阅读理解

阅读理解。

    We've all met with something that slows us down,for example,the bumps(颠簸)in the road,the setbacks.

You just have to keep in mind that a setback is only temporary and greater things lie ahead.Therefore,keep

moving forward,developing what you have,since you've already built a solid foundation on which you can

rely.

    It is easy just to quit,give up and ignore the hard work you have put into something.But we believe in

the"two steps forward,one step back"philosophy(哲学).So how can you react when something doesn't

turn out as you've expected it to be?

    First,be objective.Step back and look at the situation.Is your setback really that significant,or will it just

require a little extra effort?Then,plan your next move.You can ask for help.Don't be afraid or ashamed to

do this. Frequently, people are more than willing  to give you support and advice. You don't have to be

perfect;after all,nobody else is.Next,bounce back.Reevaluate the goals you should have set for yourself

at the beginning and retool(改组)them when necessary.Goals should be realistic and specific,but that does

n't mean they can't be flexible. Instead of  looking at  your project as a disaster or  failure, view it  with

success.Concentrate on how great it will feel after it is finally done,after you have put your all into it.Instead

of focusing on a possible unsatisfactory performance one single time,take a moment to sit back and reward

yourself for all that you have accomplished.

    Above all,don't live with regrets.Success is never easy.It remains up to you whether you will give up,or

fight  through  the tough battles  to  earn  whatever  you want. Keep reaching for your goals and you will

achieve  them. One small setback is nothing if  you really  want something and are willing to work for it

1.According to the passage,the philosophy"two steps forward,one step back"means that__________

when meeting with a setback.

A.we are supposed to quit and ignore the hard work

B.we'd better think it over before making a decision

C.we should stop to think before taking further action

D.we are expected to look at things in an all?round way

2.The underlined word"it"in Paragraph 3 refers to__________

A.a performance  

B.a success

C.a goal  

D.a project

3.When we suffer a setback,the most important thing to do is__________.

A.to keep moving forward to your goals

B.to depend on others' support and advice

C.to sit back and reward yourself for your success

D.to focus on a possible unsatisfactory performance

4.What is the passage mainly about?

A.How to avoid the bumps.

B.How to deal with the setbacks.

C.Different attitudes to the setbacks.

D.Different suggestions on your goals.

多项选择题