下列说法正确的是( )①离子化合物一定含离子键,也可能含极性键或非极性键②共价化合物一定含共价键,也可能含离子键③含金属元素的化合物不一定是离子化合物④由非金属元素组成的化合物一定是共价化合物⑤由分子组成的物质中一定存在共价键⑥熔融状态能导电的化合物一定是离子化合物
While traveling in a strange place,you'd better the local people and follow their customs (习俗).( )
A.watchB.changeC.controlD.teach
Did you enjoy in Chengdu last week?
Yes,I had great fun there.( )
A.myselfB.yourselfC.ourselvesD.themselves
Sam is doing some about the ancient Silk Road.( )
A.exerciseB.operations
C.researchD.experiments
Our team lost the basketball game and I feel very sad.
______.I believe you can do better next time.( )
A.It's rightB.It's exciting
C.It's not a good ideaD.It's not a big deal
Father's Day is coming.I'm thinking about ______.( )
A.what present I gave him
B.where will we have a big meal
C.if I planned a party for him
D.how I will give him a surprise