unknown [原创]请教两个语法问题

moonrise

1.Tooth decay could be the result of poor hygiene or from bacterica decaying food particles.

为什么是C 错.

2.According to his journals, Charles Darwin was amazed for the rich diversity of animal species he discovered in the Galapagos Island.

我认为是C错,但答案是B(for),为什么?

thank you

真老九

from>>>of,因为or连接的是两个并列的部分result of......or of......

for >>> at