单项选择题
A．at most B．at last C．at least D．at first
A．women have fought very hard for success B．women have to bear and rear children C．women have never succeeded before D．men still carry on the sex war
A．weakened the reliability of reported sightings B．increased the number of UFO sightings C．allowed more scientific study of UFO’s D．solved the age-old mystery of UFO’s