多项选择题
A.对 B.错
单项选择题
Overall, ice cream sales in the U.S.have declined 1 to ...
不定项选择Overall, ice cream sales in the U.S.have declined 1 to 2 percent in recent years, except for Haagen-Dazs and a few other super premium producers.
论文的running title 或 running head的作用是什么?A.Running title...
单项选择题论文的running title 或 running head的作用是什么?