两道语法

1.Among the symptoms of measles, which takes about twelve days to incubate, are a high fever, swelling of glands in the neck, a cough, and sensitive to light. 这题有主语吗？？？我的意思是说：among the symptoms of measles，这个由介词引导的短语可以做主语吗？

2.Copper was the first （metallic） used by humans （and is） second only（ to A B C iron） in its utility through （the ages）. D A确实是有问题，可是B中的语态也确实不对啊。请问是不是我的题有问题？谢谢