评定生产技术方案最基本的标准是( )。
A.先进适用
B.安全可靠
C.经济合理
D.客观科学
参考答案:A
-- Sorry, it's already 6 o’clock. I have to be off for an appointment.
--- OK. ________.
A.It couldn’t be better
B.You really have me there
C.Let’s call it a day
D.Take your time
When his mother came into his room, he pretended ______
A.to asleep
B.sleeping
C.slept
D.to be asleep