单项选择题
（）once said that the most beautiful things in our world are created by Labor，by the wise hands of human being.
A.GorkyB.MarxC.TolstoyD.Hugo
填空题 Academic posters could be an（）way of communicating concisely，visually and attractively.
单项选择题 One of them threatened me with a knife（）the other bound and gagged me.
单项选择题 Among the following research methods，which one is cheaper and easier？（）
