与协作配套单位签订合同时应当明确的有关事项是（）
A、项目密级和保密条款
B、质量标准
C、交付日期
D、付款方式
参考答案：A
--- I hear Andy and Lily are going to have a party to celebrate their ten years of ____ .
--- Really? They have ____ for ten years?
A．marrying, married
B．marriage, married
C．marrying, got married
D．marriage, been married
班主任了解和研究学生的方法有哪些
