Directions:
In this part there are ten incomplete sentences, each with four suggested answers. Choose the one that you think is the best answer. Mark your answer on the ANSWER SHEET by drawing with a pencil a short bar across the corresponding letter in the brackets.
Living in the central Australian desert has its problems, ______obtaining water is not the least.

A．1) most probably means______.A. America has suddenly become a nation of old peopleB. gerontology has suddenly become popularC. name elderly professors are found on American campusesD. American colleges have realized the need of enrolling older students