含羞草的叶子被碰后会合拢,这说明生物具有( )
A:生长现象
B:生物能对外界刺激作出反应
C:繁殖
D:呼吸
—What do you think of the boy's painting?
—I've never seen a person with sense of art.
9-7=____
8-4=____
10-5=____
6-3=____
下列图象中,属于某种晶体凝固图象的是( )