river is well protected as it is _ of their drinking water

题目

river is well protected as it is _ of their drinking water
1.the river is well protected as it is _ of their drinking water.、
A.only the source B.the only source
C.the source only D.an only source
2.He drove ___ through the busy streets trying to keep a distance from the vehicles in front.
A.carefully extremely B.extremely carefully
C.extreme carefully D.extremely careful

答案

B
B