Does the sentence "Overall ratings for the season were down 10% from season six, which is in line with the fall in viewership across all networks due in part to the 20072008 Writers Guild of America strike." provide a valid answer to the question "Why were television ratings down across the board during American Idols seventh season?"

A: yes

Does the sentence "However, after Kerry's first six months in the State Department, a Gallup poll found he had high approval ratings among Americans as Secretary of State." provide a valid answer to the question "Who published the Ivory Tower Survey?"

A: no

Does the sentence "Today's environmental problems are the salination of the Werra river, caused by discharges of K+S salt mines around Unterbreizbach and overfertilisation in agriculture, damaging the soil and small rivers." provide a valid answer to the question "What is causing the salination of the Werra river?"

A: yes

Does the sentence "Christianity was established in the region by the Romans, and saw the establishment of monasteries and churches in the high regions." provide a valid answer to the question "What area still has intricate frescoes?"

A:
no