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 possible--better control, if not eradication, of the other infections such as measles and yaws.