烤漆玻璃主要用在哪里？

Kate met a lot of problems _____ she was going over her lessons. [ ]

A. before

B. as soon as

C. until

D. while

The whole towns were simply swept aside by the power of water.Cars, trains and buildings could not

________, ________ the people who stood in the way.[      ]

A. remain; or rather  

B. survive; let alone

C. exist; more or less  

D. achieve; besides

居住区环境景观设计的( )，强调赋予环境景观亲切宜人的艺术感召力，通过美化生活环境，体现社区文化，促进人际交往和精神文明建设，并提倡公众参与设计、建设和管理。

A．地域性原则
B．社会性原则
C．历史性原则D．经济性原则

P2P网络存在集中式、______、分布式结构化和混合式结构化4种主要结构类型。

开展党的（）是党的十八大作出的重大决策。