GWD-29 Q7 Q35 求助！

Until a few centuries ago, any large bones discovered in the fields or caves of Europe, now known to be large prehistoric animals, were usually assumed to be the remains of giants and were often displayed as curiosities in castles, palaces, town halls, churches, and monasteries.

1. now known to be large prehistoric animals, were usually assumed to be
2. presently known as from large prehistoric animals, were usually assumed as
3. bones now known to be those of large prehistoric animals, were usually assumed to be
4. bones known at present as of large prehistoric animals, were usually assumed as those of
5. currently known as those of large prehistoric animals, were usually assumed to be those of

请问答案C 如何理解？

If the statements above are true, then it is also possible that in Patton City

1. the number of days with heavy rainfall was lower in 1990 than in 1910
2. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
3. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
4. the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910
5. the average amount of rainfall per month was lower in 1990 than in 1910

此题也不明白 答案给的是A