问题
选择题
CO燃烧时火焰的颜色是[ ]
A.黄色
B.蓝色
C.紫色
D.淡蓝色
答案
答案:B
CO燃烧时火焰的颜色是[ ]
A.黄色
B.蓝色
C.紫色
D.淡蓝色
答案:B
用方框中所给单词的适当形式填空,每个单词限用一次。
小题2:You must be careful when you __________ the street. 小题3:---I passed the last exam. --- Oh, you’re really a _________ dog. 小题4:---Can I help you, madam? ---Two kilos of ___________, please. 小题5:Now lots of wild animals are in _________. We must try our best to protect them. |