Questions and exercises  are given by the computer, which decides ______ to move the students ahead, review an easier level, ____ give more work on the same level.

A．either, or

B．both, and .

C．whether, or

D．not only, but also

患者，男，78岁，全身皮肤瘙痒，以夜间为甚。查：皮肤较干燥，躯干四肢抓痕累累，伴头晕眼花，失眠多梦。舌淡、苔薄白，脉细。治法宜选用

A．疏风清热凉血

B．清热利湿止痒

C．凉血清热润燥

D．养血润燥祛风

E．活血化瘀祛风