从广义上讲，投资建设项目是指为了特定目标而进行的()。
A．一次性事业
B．一次性任务
C．投资建设活动
D．单项工程
参考答案：C
抗ENA抗体主要包括哪几种?试述抗ENA抗体的临床意义?
Read and translate. 翻译下列句子。
1. What did you do last weekend?
2. Did you help them clean their room?
3. I visited my grandparents.
4. Wu Yifan was busy last weekend.
5. Yesterday was a fun day.
