单项选择题
Scientists are trying to make（）investigation.
A．further B．farther C．furthest D．farthest
单项选择题 It is times（）our city.
单项选择题 It was believed that there was no limit（）the energy resources on our earth.
单项选择题 The lecture hall in the university has a seating（）of over 2 000, but that night only 1 000 people were present.
