热风润叶机还具有（），解除解把机未解开的烟把的作用。
参考答案：掺和配叶各种烟叶
---Congratulations to you on making such great progress!
---Thanks, but I would do better ________ I was given more time.
A．if
B．unless
C．though
D．because
Excel中用于存储数据的文件叫做工作簿，其扩展名系统默认为．XLS
