题目

目前世界上最大的质子同步加速器，能使质子的能量达到1×1012eV.我国在1989年初投入运行的高能粒子加速器是________，它能使电子束流的能量达到（28+28）×108eV. 答案：北京正负电子对撞机选择恰当的选项补全对话，其中两项多余。A: Excuse me, Jim. What do you want to do this Saturday?B: Nothing much.      1       A: What about going to the zoo in our city?B:       2       .A: Because I hear that eight pandas have just arrived there.B: Really?      3       A: They're from Sichuan, and they will welcome the friends all over the world during the 2010 Expo.B: That's great !      4       A: I also hear the eight pandas like to eat apples. Why not take some apples?B:       5       Can't you see "No feeding" in the zoo?A: Sorry, I  forgot. Well, remember to take a camera.B: OK!        A. We'd better not.B Why do you want to go to the zoo?C. What's up?D. Where are they from?E. Have a good time !F. What about you? 'G. I'd love to