下列现象中，不能体现生物特征的是（ ）
A：植物落叶
B：H7N9病毒能繁殖后代
C：含羞草受到碰触叶片会合拢
D：钟乳石慢慢长大
①社会实践是文化创新的源泉
②文化创新促进民族文化繁荣
③文化发展的实质是文化创新
④社会实践是文化创新的动力
A
⑴Who are they? ____
⑵Where did you live?____
⑶Is this your grandpa?____
⑷Did he learn Chinese ?____
⑸What's he doing?____
B
A.Yes, it is.
B.They are my grandparents.
C.He's reading a book.
D.No,he didn't.
E.I lived in a small house.
