在SQL中，可以使用（）语句执行恢复数据库的操作。
A. BACKUP DATABASE
B. RESTORE DATABASE
CREATE DARABASE
DROP DATABASE
查看答案
Directions:In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).Questions 1 and 2 are based on the news report you have just heard.[音频]1
A. Her grandfather.
B. Her grandmother
C. Her friend Erika.
D. Her little brother
2
A. By taking pictures for passers-by.
By selling lemonade andpictures
C. By workingpart time at a hospital.
D. By asking for help on social media.
Questions 3 and 4 are based on the news report you have just heard.[音频]3
A. Testing the efficiency of the new solar panel.
B. Providing clean energy to five million people.
C. Generating electric power for passing vehicles.
D. Finding cheaper ways of highway construction
4
A. They are only about halfan inch thick.
B. They are made from cheap materials.
C. They can be laid right on top of existing highways.
D. They can stand the wear and tear of natural elements
微信支付 
支付宝支付