Mary became （）homesick and critical of the United States, so she fled from her home in west Bloom- field to her hometown in Austria.

单项选择题The jobs of wildlife technicians and biologists seemed （）to him, but one day he discovered their difference.

A．identical
B．vertical
C．parallel
D．specific

单项选择题Please don't （）too much on the painful memories. Everything will be all right.

A．hesitate
B．linger
C．retain
D．dwell