The patient recovered from the illness________and three weeks later, he left the hospital.
A:sooner or later
B:little by little
C:by and by
D:all in all
动物是人类的好朋友,下图中分别列举了鲫鱼、蚯蚓、野鸭、家兔和蝗虫五种动物,请分析回答问题:
t/s
0
50
150
250
350
n(PCl3)/mol
0.16
0.19
0.20
下列说法正确的是( )
When I entered the room, I found he was b____ in his work, so he didn't notice me come in.