单项选择题
Computer software（）some 70percent of our range of products.
A.picks upB.focuses onC.accounts forD.is based on
单项选择题 Alice Green, ( ), won the first place in the speech contest.
单项选择题 ( ) journey of( ) thousand miles must begin with single steps.
单项选择题 When you phoned，she was busy（）（the dishes）.
