A：AABb
B：Aabb
C：AaBb
D：aabb
New Year's Day usually comes __________ February.
—This history book is of great value.
—Exactly. _____ can be enjoyed from it ______ you have a deep understanding of it, however.
给多音字组词。
降：jiàng____ xiáng____
落：là____ luò____
