问题 选择题

2011年3月11日,日本发生9级地震,引起核泄漏,放射性物质进入大气。 原子核内中子数是(    )

A.53

B.78

C.131

D.184

答案

答案:B

考查原子的组成及表示方法。在表示原子组成时元素符号的左下角表示质子数,左上角表示质量数。因为质子数和中子数之和是质量数,所以该核素内中子数是131-53=78,所以答案选B。

单项选择题
阅读理解

How many times have you got upset because someone wasn’t doing his job,because your child isn’t behaving?How many times have you been irritated (恼怒的) when you’ve planned something carefully and things didn’t go as you’d hoped?

This kind of anger and irritation happens to all of us—it’s part of the human experiences.

One thing that irritates me is when people talk during a movie,or cut me off in traffic.Actually,I have a lot of these little annoyances—don’t we all?And it isn’t always easy to find peace when you’ve become upset or irritated.

Let me tell you a little secret to finding peace of mind:see_the_glass_as_already_broken.

See,the cause of our stress,anger and irritation is that things don’t go the way we like,the way we expect them to.Think of how many times this has been true for you.And so the solution is simple:expect things to go wrong,expect things to be different than we hoped or planned,expect the unexpected to happen.And accept it.

One quick example:on our recent trip to Japan,I told my kids to expect things to go wrong—they always do   on a trip.I told them,“See it as part of the adventure.”

And this worked like a charm.When we inevitably (不可避免地) took the wrong train on a foreign­language subway system,or when it rained on the day we went to Disney Sea,or when we took three trains and walked 10 blocks only to find the National Children’s Castle closed on Mondays...they said,“It’s part of the adventure!” And it was all OK—we didn’t get too bothered.

So when the nice glass you bought inevitably falls and breaks some day,you might get upset.But things will be different,if you see the glass as already broken,from the day you get it.You know it’ll break some day,so from the beginning,see it as already broken.Be a time­traveler,or someone with time­traveling vision,and see the future of this glass,from this moment until it inevitably breaks.And when it breaks,you won’t be upset or sad—because it was already broken,from the day you got it.And you’ll realize that every moment you have with it is precious.

小题1:The author would probably agree that________.

A.we should control our anger and irritation

B.we must get well prepared for the future

C.optimism can help us overcome our anger and irritation

D.anger and irritation is a natural part of our life小题2:The purpose of the author is to________.

A.tell us his own experience in life

B.advise us how to find peace of mind

C.tell us a happy trip he took with his children

D.ask us to see things from both sides小题3:By the underlined part (in Para.4),the author tells us  to________.

A.get ready for the worst result of things

B.enjoy the process of things

C.expect little from life

D.find the relationship between cause and effect小题4:We can learn from the passage that the author________.

A.often gets angry in his life

B.can adjust his state of mind accordingly

C.always expects others to act in his way

D.always suffers from his anger and irritation