单项选择题 I knew nothing of the motives behind his recent move,and I don't know either the person to put him up to the action（）.

单项选择题 Just last week, for example, the World Health Organization (WHO) announced the disturbing disclosure that SARS may be pretty deadlier than previously believed（）.

单项选择题 During many sectors are foundering, the $ 21 billion videogame-software industry is booming, adding game developers at a rate of 2,500 a year in the United States alone（）.