A：to go
B：/
C：going
D：go
求函数y=(1+cos2x)3 的导数.
____（.）
I will tell you a secret, but you must promise it around.
下列现象中，机械能转化为内能的是（ ）
在“构建和谐校园”的活动中，李雷被评为“文明之星”。你是他的好朋友，请用简短的英语对他进行介绍，并写一句你最想对他说的话。 Li Lei is my good____ He is quite friendly and helpful. He is always trying to help____He does well in all his ____ And he has many different____ of hobbies.He is always well-behaved. He sets us all a good example. He is the hero in our heart.写一句你最想对他说的话：____
