— What did the teacher say just now?
— He said that the earth 　　　 around the sun. A.
go B.
goes C.
going D.
will go

火山成因矿床的重要类型有 A、斑岩型铜矿床 B、斑岩型钼矿床 C、玢岩型铁矿床 D、金刚石矿床 E、铬铁矿矿床

多项选择题火山成因矿床的重要类型有
A、斑岩型铜矿床
B、斑岩型钼矿床
C、玢岩型铁矿床
D、金刚石矿床
E、铬铁矿矿床

5. The discussion section of research paper is where th...

单项选择题5. The discussion section of research paper is where the author most effectively demonstrates his/her ability to think critically about an issue.
A、正确
B、错误

2.数据库类型：层次数据库、网状数据库、（   ）

问答题2.数据库类型：层次数据库、网状数据库、（   ）