杀死微生物的温度界限，称为
A．致死温度区B．生长最适温度C．生长最低温度D．致死温度E．适宜温度区
参考答案：D
进入主人家庭的礼仪（）
A、轻轻敲门，等同意后入室
B、敲门二下就可入室
C、不敲门就可入室
D、经同意就可入室
- Have you finished writing your book? - Yes. It _______ and _______ soon.
A．is printing; is coming out
B．is being printed; will come out
C．is going to print, will be come out
D．is printed; has come out
