未知题型 My brother wasn"t badly hurted, but he injured his leg and had to ( ) around for a few weeks.

单项选择题 债券型基金是指（）%以上的基金资产投资于国债、企业债等债券的基金

未知题型 差异化竞争战略是指将成本降到最低，使企业成为全行业成本领先者。