问题
选择题
科学家通过实验证明噬菌体的遗传物质是DNA，而非蛋白质。实验的关键是要获得含放射性同位索标记的噬菌体，其操作顺序为
①用分别含有35S和32P的培养基培养细菌 ②用噬菌体分别与含有35S和32P的细菌混合培养 ③放射性检测 ④离心分离 [ ]
A．①②④③
B．①②③④
C．②①③④
D．②①④③
答案
答案：A
搜题请搜索小程序“爱下问搜题”
科学家通过实验证明噬菌体的遗传物质是DNA，而非蛋白质。实验的关键是要获得含放射性同位索标记的噬菌体，其操作顺序为
①用分别含有35S和32P的培养基培养细菌 ②用噬菌体分别与含有35S和32P的细菌混合培养 ③放射性检测 ④离心分离 [ ]
A．①②④③
B．①②③④
C．②①③④
D．②①④③
答案：A
请根据短文内容，填写表格，每空不超过3个单词。
Many people would like to watch sport matches. First, you need to know about audience manners.
Most sporting arenas(竞技场)have rules for audience written on the back of the tickets. Read your ticket carefully before you arrive. Try to reach your seat half an hour before the start of the event and don’t leave when a game is in progress. When you leave, remember to take away your soft drink bottles and other rubbish.
During exciting games, try to control yourself. Don’t criticize the performance of players and coaches. Be careful with your words, since some may cause anger among other people in the audience.
Clapping is a special form of body language you can use to communicate with players, but you should do it properly. When players first appear, clap your hands together to welcome them, but don’t go on for too long. After an excellent performance, clap warmly. If someone fails, your clapping will help encourage them.
Clapping is not welcome, however, while players need to keep their attention. Various sports have various rules for the audience.
Enjoying artistic gymnastics silence. But lots of cheering can really help basketball and football players. When you watch snooker and table tennis matches, flash photography is not allowed. Mobile phones are not allowed in shooting centers.
To be a good audience, you should take time to learn the game—particular rules and related culture of each event.
Title: Good Audience Manners
| Topic | 小题1:______ | |
| Before games | Sporting arenas | read your tickets carefully reach and leave there in time take your 小题2:_____ when leave |
| During games | Exciting games | pay attention to your behaviour and 小题3:____ |
| Clapping | use it properly | |
| artistic gymnastics | keep silent | |
| Basketball and football | You should cheer | |
| Snooker 小题4:________ | You should not take photos. | |
| Shooting centers | Don’t use mobile phones | |
| 小题5: ________ | How to be a good audience | to learn the game particular rules and culture |