《中华人民共和国教师法》自____起施行。
⑴Where is Jimmy?____
⑵What are the sheep doing?____
⑶What are you doing?____
⑷What is Amy doing?____
⑸Is he playing ping-pong?____
A. Yes, he is.
B. He is in the classroom.
C. She is singing and dancing.
D. I'm walking.
E. They're running on the grass.
{an}是等比数列,且a2=4,a6=16,则a4=( )
折一折,填一填。
折出了2个____形。 折出了2个____形。
折出了____个____形。 折出了____个____形。