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问题 选择题

有三种微粒An+，Bm-，C，它们具有相同的电子层结构，则三种元素的原子序数（质子数）由大到小的顺序是（　　）

A．A，B，C

B．C，B，A

C．A，C，B

D．B，C，A

答案

在原子中，原子序数=质子数=核外电子数，依据三种微粒An+，Bm-，C，它们具有相同的电子层结构，

设C的质子数为x，则三种微粒的质子数分别为：x+m，x-n，x，

由此可知它们由大到小的顺序是：An+，C，Bm-，

故选C．

单项选择题

某患者左上2锥形牙，与邻牙之间约1mm间隙，下列修复方法中不宜采用的是（）

A.全瓷冠

B.塑料全冠

C.树脂贴面

D.3／4冠

E.全属烤瓷冠
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单项选择题

Honesty comes in many forms. First there’s self honesty. Is what people see the real article or do you appear through smoke and mirrors I find that if I try to be something I’m not, I feel unsure of myself and take out a part from my PBA (personal bank account). I love how singer Judy Garland put it, "Always be a first class version of yourself, instead of a second class version of somebody else. "
Then there’s honesty in our actions. Are you honest at school, with your parents, and with your boss If you’ve ever been dishonest, I think we all have, try being honest, and notice how whole it makes you feel. Remember, you can’t do wrong and feel right. This story by Jeff is agood example of that:
In my second year of study, there were three kids in my math class who didn’t do well. I was really good at it. I would charge them three dollars for each test that I helped them pass. I’d write on a little piece of paper all the right answers, and hand them off.
At first I felt like I was making money, kind of a nice job. I wasn’t thinking about how it could hurt all of us. After a while I realized I shouldn’t do that any more, because I wasn’t really helping them! They weren’t learning anything, and it would only get harder down the road. Cheating certainly wasn’t helping me.
It takes courage to be honest when people all around you who are getting away with cheating on tests, lying to their parents, and stealing at work. But, remember, every act of honesty is a deposit into your PBA and will build strength.

In the last paragraph the author mainly wants to express ______.

A．one must be brave to be honest
B．it’s difficult to be honest when others are not
C．one should be honest when making a deposit
D．honestly in one’s actions can help him in the future
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