The study of the wild world may help to make the world easier----A understandB to be understoodC to understand D understood 为什么选C
问题描述：
The study of the wild world may help to make the world easier----A understand
B to be understood
C to understand
D understood 为什么选C
答
make +n + adj 的结构。
等于 make the world easier for people to understand . 这种结构中只要有difficult, easy, interesting,hard等形容词的时候，不定式里是不需要用被动语态的。比如，初中英语中有的：The film is interesting to watch ===It is interesting to watch the film.只要能换成这种结构，就不要用不定式的被动形式。
答
这里是形容词加动词不定式用来做宾语,表目的.