不定项选择 ‌It is not difficult to collect information but the difficulty lies in how to use them effectively.   ​

单项选择题 根据不同类型突发公共事件的特征与规律，有相应的政府管理部门作为公共危机管理的主责部门，从而制定和实施有针对性的公共危机管理策略、措施、方法，这是分级负责的重要体现。（ ）A.对B.错

单项选择题 My brother is busy ______ for his first job interview.A. preparingB. to prepareC. preparedD. prepares