The investigations of many psychologists and anthropologists support the generalization of there being little that is a significant difference in the underlying mental processes manifested by people from different cultures.
(D) that there is little that is significantly different
(E) that there is little of significant differences
In recent years cattle breeders have increasingly used crossbreeding, in part that their steers should acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor.
(A) partly because certain characteristics should be acquired by their steers
(B) partly to acquire certain characteristics in their steers
就无法判断to还是because了。