美国国防部和国家标准局的可信计算机系统评估准则(TCSEC)首次出版于 _______年。
A.1983
B.1980
C.1990
D.1985
参考答案:A
改为同义句,每空一词。
1. My dad stopped drinking two weeks ago.
My dad _______ ________ drinking two weeks ago.
2. Are you proud of being a volunteer?
Do you _______ ________ _______ being a volunteer?
3. We were surprised that the little girl could draw so well.
________ ________ ________, the little girl could draw so well.
4. Jane doesn't go to work by bus any longer.
Jane _______ ________ _______ to work by bus.
5. Andy has decided to be a scientist when he grows up.
Andy has ________ _________ ________ to be a scientist when he grows up.
________ important ______ us to listen carefully in class!
A.That’s; of
B.It’s; for
C.This is; for
D.It’s; of