论述当代教学组织形式中合作学习的形式及特征。

沟壑纵横的地表特征是对哪一高原的描述？[ ]

A．云贵

B．黄土

C．内蒙古

D．青藏

Which of the following health-promoting activities should the nurse teach the client with a new laryngectomy()

A. Cleanse the mouth three times a day.

B. Avoid taking tub baths.

C. Develop an aggressive program of exercise to increase airway functioning.

D. Dehumidify the air for comfort.

下列（）不是大体积混凝土裂缝产生的主要原因。

A.温度

B.收缩

C.结构的强度、刚度不够

D.不均匀沉降

拆除导线时，锚线装置应安全、稳定、工作可靠。