Megan failed to read Huw's letters because _______.
A:her father kept them
B:they were lost on the way
C:she moved to another city
D:he didn't post them at all
“大体上讲,住所是很简朴的,清洁、干燥,很卫生。”这句话出自____国著名昆虫学家____所写的《____》。