You are working in an online transaction processing （OLTP） environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command， the System Change Number （SCN） was 663571. After flashing back the CUSTOMERS table， you realize that the table is not in the correct state and the resultant changes are not what you had desired. So， you need to reverse the effects of the FLASHBACK TABLE command while ensuring that： a） No other user data in the database is affected. b） The operation takes the minimum possible time. Which option would you choose？（）
第1题：
By the time you arrive, I ______ working for two hours
A. will be
B. can
C. will have been
D. have been
第2题：
A、No, I can’t.
B、It doesn’t matter.
C、Sure, why do you need it
第3题：
A、No, not at all.
B、I’m making a bookcase.
C、Yes, I really work hard.
D、Thanks.
第4题：
I am working now. I can't go with you.()
第5题：
A、actually
B、punctually
C、gradually
D、eventually
第6题：
A、taking out
B、working out
C、filling out
第7题：
—Haven’t seen you for ages!What are you busy doing now? —
A、I hate the weather here
B、My hair is getting a bit longer
C、Yeah, thanks for coming
D、I am working part time in a bookshop, you know.
第8题：
A. fond of
B.interest in
C. appear to
D. appeal to
第9题：
I' m looking forward to()together with you.
A. worked
B. work
C. working
第10题：
Could you tell the working parts of a gas welding gun?