单项选择题
Catchy words generally survive because they are the fav...
判断题Catchy words generally survive because they are the favorites of their users.
线是运动中的点。（ ）
单项选择题线是运动中的点。（ ）
Professional conference should be only held by professo...
不定项选择Professional conference should be only held by professors at universities in specific area.
