【题目】China will checks of soybeans from the United States after tons of soybeans were found coated with three types of harmful chemicals.
A. mix up B. fix up
C. show up D. step up
在线课程【答案】D
【解析】考查动词短语。A. mix up混合；B. fix up修理，解决；C. show up出现；D. step up加强，增加。句意：中国将加强对大豆的检查，此前发现有大量的大豆被发现含有三种有害化学物质。此处表示加强检查，故选D.