Many photographers prefer to take pictures at twilight when they can take advantage of the special effects of the setting sun.

单项选择题Psychologists have done extensive studies of how well patients comply with doctors’ orders.

单项选择题The Taconic Mountains form part of the dividing line between New York and Massachusetts.

单项选择题Sue was distraught waiting for her mother to come to last night.

单项选择题Male lions remain aloof from the day-to-day activities of their families.