Question

6. The        economic changes of the past few years have brought new difficulties threatening the effectiveness of national AIDS control programs.

   A. wealthy   B. novel

   C. obvious   D. fundamental

Answer 1

6. D fundamental意为"根本的，基础的"， fundamental economic changes意为"基本的经济改革"。 novel用作形容词时意为"新鲜的，鲜活的"。