Which group of people are most optimistic?
A．Ordinary white Americans.
B．American immigrants.
C．African Americans.
D．The Midwest Americans.

判断题比率量表的零点是绝对的。()

判断题体育锻炼的主要项目有身体素质锻炼和运动能力锻炼。()

未分类题Oh, what a nuisance! It______so easy for me to bring those photographs I wanted to show you, and I have left them on the table at home.A．would have beerB．had beenC．would beD．was

判断题“三环结构说”的核心是世界观。()

未分类题______this information, they sat down again to wait.A．After givenB．On givingC．Having been givenD．After having to give