说明理由

说明理由
1.I find their interests are too narrow,and ______ of them ever venture outside their subjects.
A.the few B.very few C.only few D.a few
2.The number of children who contracted colds and visited the hospital ______ in the country since last fall.
A.increased B.would contracted C.has increased D.had increased
3.Some living creatures can change certain features of their environment so as to suit _______.
A.it B.itself C.them D.themselves