问题 选择题

某微粒用表示,下列关于该微粒叙述正确的是                            

A.所含质量数=A-n

B.所含中子数=A-Z

C.所含电子数=Z+n

D.所含质子数=A+Z

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的是质子数,左上角表示的是质量数,右上角表示所带电荷数。质子数和中子数之和是质量数,质子数等于核外电子数,因此该微粒的质子数是Z,中子数是A-Z,核外电子数是Z-n,所以选项B是正确的。

阅读理解

阅读理解。

     ● Health, Wellness and the Politics of Food

     9:00-9:45a.m. Blue Tent

     Panelists(成员): Jami Bernard, David Kamp, Marion Nestle and Peter Singer.

     Hosted by Denise Gray, science writer for The New York Times.

     How does what we eat not only affect our bodies, but also the world? The food and nutrition experts

debate the role that the diet plays in both personal and global health, and present a look at food politics.

     ● Sports writing: For the Love of the Game

      9:50-10:35a.m. Blue Tent

     Panelists: Christine Brennan, Ira Rosen, Joe Wallace and Joe Drape.

     Hosted by William C. Rhoden, sports writer for The New York Times.

     Whether catching that key moment of victory or defeat, or covering breaking news, sports writers are

anything but audience. Listen as some professionals discuss the special experience in reporting of sports news.

     ● The Art of the Review

     11:15-12:00a.m. Green Tent

     Panelists: John Freeman, Barry Gewen, David Orr, Celia McGee and Jennifer Schuessler.

     Hosted by Sam Tanenhaus, editor for The New York Times Book Review.

     How much of an effect does the book review have on book sales? Join this group of critics as they

discuss the reality of the book review and bestseller lists, and how they choose books for review.

     ● New York Writers, New York Stories

     3:00-3:45p.m. Green Tent

     Panelists: Cindy Adams, Richard Cohen, Ric Klass and Lauren Redniss.

1. If you like sports writing, you will most probably______.

A. go to Blue Tent at 11:15a.m.

B. enjoy Jami Bernard's talk

C. listen to Christine Brennan

D. attend the Art of the Review

2. Sam Tanenhaus is in charge of _____.

A. The Art of the Review

B. Health, Wellness and the Politics of Food

C. New York Writers, New York Stories

D. Sports Writing: For the Love of the Game

3. We can learn from the text that ______.

A. sports writers are a type of audience

B. New York Times is a gold mine company

C. Denise Grady will discuss political policy

D. book reviews may affect book sales

单项选择题