A:臭氧空洞
B:酸雨
C:光化学烟雾
D:温室效应
如图,若l1∥l2∥l3,如果DE=6,EF=2,BC=1.5,那么AC=____ .
读课文《永远的白衣战士》,把下列词语补充完整。
心甘____ ____截铁 泪如____
⑴The man couldn't find a ____ seat.
⑵The man asked the lady put the dog on her ____.
⑶Finally the bus driver ____ the bus.
⑷The man took out a ____.
⑸Guess what the dog had in its ____.