优化开发区域
参考答案：
是指国土开发密度已经较高、资源环境承载能力开始减弱的区域。
The Libians will never forget Oct. 20, 2011, ____ Gaddifi was killed in Sirte, ____ shocked the whole world.
[ ]
A. that; which
B. when; which
C. which; when
D. that; that
碧螺春是（）名优绿茶的代表。
A、卷曲形
B、扁平形
C、盘花形
D、兰花形
