Does "Although its maximum usable range was similar to the previous systems, it was not unknown for specific buildings to be hit." contain the correct answer to "Which system was the most complex of the three?"

A: no

Does "From the 9th century, the Pecheneg nomads began an uneasy relationship with Kievan Rus." contain the correct answer to "How early did the relationship begin between the Pecheneg and the Rus?"

A: yes

Does "Alfred Wegener's theory of "continental drift" was widely dismissed when he proposed it in the 1910s, but new data gathered in the 1950s and 1960s led to the theory of plate tectonics, which provided a plausible mechanism for it." contain the correct answer to "The idea of an ice-age that completely covered a continent was suggested by whom?"

A:
no