题目选项分析

The success of the program to eradicate smallpox has stimulated experts to pursue something they had not previously considered possible-better control, if not eradication, of such infections as measles and yaws.

The success of the program to eradicate smallpox has stimulated experts to pursue what they had not previously considered a possibility--better control, if not eradication, of such infections like measles and yaws.