净化、优化人才开发环境有助于建立有效的（）政策机制。
A.知识开发
B.人才开发
C.潜能开发
D.创新开发
参考答案：B
翻译画线部分。
1. Today is a special day in China. ________________
2. My parents bought me new red pants. ________________
3. What else do you do? ________________
4. What's in the dumplings? ________________
5. Let's make dumplings. ________________
专为科学研究和实验
