A client diagnosed as having panic disorder with agoraphobia is admitted to the inpatient psychiatric unit. Until her admission, she had been a virtual prisoner in her home for 5 weeks, afraid to go outside even to buy food. Which of the following should be the nurse’s overall goal of care

A. To help the client perform self-care activities.
B. To help the client function effectively in her environment.
C. To help control the client’s symptoms.
D. To help the client participate in group therapy.

若直角三角形的一个锐角为20°，则另一个锐角等于（    ）°。