A:K+、ClO-、Ba2+、HCO3-
B:Na+、Al3+、NO3-、SO42-
C:Fe3+、K+、SCN-、Cl-
D:Mg2+、NH4+、Fe2+、NO3-
⑴When do you eat breakfast?____ A.It's warm and sunny.
⑵Can you make a snowman now?____ B.No,it isn't.
⑶What's the weather like today?____ C.I eat breakfast at 7: 15.
⑷What would you like to do?____ D.No,I can't.
⑸Is it windy and cold?____ E.I would like to go swimming.
直接写出计算结果.
6.7+4.3=____
0.32=____
12 ÷23 =____
3%×5%=____
8÷0.02=____
23 ﹣ 14 =____
12×13÷12×13 =____
3a×4a=____
— Why does Yun Tianming look so tired out these days?
— He pracitses basketball every day so that he could ____ for the Slam Dunk Contest.
请结合两次世界大战有关史实,回答下列问题: