为防止产生继发龋，固定修复体设计应考虑：（）A.必须覆盖点隙裂沟及脆弱的牙体组织；

阅读理解。

     "Tom? Are you in bed yet?" called Mrs White. There was no answer. Mrs White put down her book and

went to her 14-year-old son's room. Tom was sitting in front of a bright computer screen on which a colorful

dragon(龙) jumped and shouted. 

     "Oh, Tom! You're still playing on that computer. You must stop now, it's half past eleven. If you don' t go

to bed soon, you'll be very tired tomorrow," said Mrs White. 

     "But I've nearly beaten the dragon," said Tom. Mrs White could see the excitement (激动) on her son's

face. She sat down beside him. 

     "You are always playing on that computer. You spend more time with this machine than with your family,"

she said with a smile. "What's so special (特别的) about it? Show me what it can do!" 

     Tom was very excited. "I think this is a very good computer, Mum!" he said happily. "There's so much

memory(内存) and it has some wonderful software programmes. This game, Dragonsplayer, is my favourite,

but I sometimes borrow games from Danny and other friends. I don't have to worry about any infected

(被感染的) disks (磁盘) because I have a virus(病毒) detector(监测器) which can go over any disk and

check it for viruses. Let me show you!" Tom began tapping(敲打) keys on the keyboard(键盘). The screen

changed in answer to his orders(命令). 

     "Oh, Tom," laughed Mrs White, "I'm sure it's a wonderful computer, but I' m afraid I don't know what

you're talking about."

阅读短文，判断正(T)误(F)。

( ) 1. When Mrs White was calling Tom, he was lying in bed reading.

( ) 2. This story happened after Tom had slept for some hours in the evening.

( ) 3. Tom was very excited because he had nearly beaten the dragon in the computer.

( ) 4. Tom liked playing computer games very much.

( ) 5. Tom didn' t want to talk about the computer with his mother.

(20分)十八届三中全会将城镇化战略概括为十六个字，即“以工促农、以城代乡、工农互惠、城乡一体”的新型工农城乡关系。随工业化和城市化的快速推进，我国出现了城乡空间重构的趋势。下图为城乡空间重构概念模式图。阅读图文材料，回答下列问题。

（1）从生产、生活和生态角度，说明“城乡空间重构”的内涵。(6分)

（2）分析“农田连片规模经营”对农业现代化的促进作用。(6分)

（3）从地理的角度，阐释城乡之间产业的分工与协作。(8分)

如图，长为L=1.0m．质量为M=1.0kg的木板AB静止放在光滑水平面上，在AB的左端面有一质量为m=1.0kg的小木块C(大小不计)．现以水平恒力F=20.0N作用于C,使C由静止开始向右运动至AB的右端面．已知C与AB之间的动摩擦因数为μ=0.5.求力F对C做功多少?(以地面为参照物．g取10m/)

支气管哮喘与慢性阻塞性肺疾患的鉴别最有价值的是（）

A.肺气肿体征

B.两肺普遍哮鸣音

C.支气管舒张试验阳性

D.咳嗽、咳痰、喘息病史

E.呼气期带喘鸣的呼吸困难

丽江古城纳西族的“百科全书”指什么书？