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
