单选题 Wireless waste from cell phones, pocket PCs, and music players ______ special problems because they have toxic chemicals in batteries and other components.
A. pose B. commit C. transport D. expose

【正确答案】 A
【答案解析】pose造成，形成，提出问题。commit让犯错误，干坏事。transport传送，运输。expose揭露，暴露。