如图所示是某反应前后的微观示意图,“○”和“●”表示两种不同的原子.则该反应( )
A:是化合反应
B:有单质生成
C:反应前后分子种类不变
D:参加反应的两种分子个数比为4:1
Today she'll____ ____to school today.
⑴Let's go to the library.____ A.
⑵School is over.It's time to go home.____ B.
⑶It's hot.I can swim.____ C.
⑷Today is snowy and cold.____ D.
⑸We have art class at 3 o'clock.____ E.
下列说法中正确的是( )
I see ___ elephant..