填空题
To achieve good grades in examinations at university, you need to: have academic ability. be （） . think clearly. observe time management practices.
relaxed
单项选择题 函数y=2x-1的反函数为（ ）
问答题 请计算该公司当月应纳营业税额。
单项选择题 函数，y=lg(2x-1)的定义域为（ ）
