（）once said that the most beautiful things in our world are created by Labor，by the wise hands of human being.

Academic posters could be an（）way of communicating conc...

填空题Academic posters could be an（）way of communicating concisely，visually and attractively.

One of them threatened me with a knife（）the other bound...

单项选择题One of them threatened me with a knife（）the other bound and gagged me.

Among the following research methods，which one is cheap...

单项选择题Among the following research methods，which one is cheaper and easier？（）