GRE Text Completion: ETS Official Practice 150-GRE OP150:填空 - 0CL7IP4N5LJ7Y615O

If big sums are to be spent on cleaning up environmental disasters, it is better to spend them on unglamorous but ____________ problems such as unsanitary water in Third World countries. A. futile B. ephemeral C. pressing D. controversial E. transitory F. critical